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COLLECTD.CONF(5) collectd COLLECTD.CONF(5)

NAME
collectd.conf - Configuration for the system statistics collection
daemon collectd

SYNOPSIS
BaseDir "/var/db/collectd"
PIDFile "/run/collectd.pid"
Interval 10.0

LoadPlugin cpu
LoadPlugin load

<LoadPlugin df>
Interval 3600
</LoadPlugin>
<Plugin df>
ValuesPercentage true
</Plugin>

LoadPlugin ping
<Plugin ping>
Host "example.org"
Host "provider.net"
</Plugin>

DESCRIPTION
This config file controls how the system statistics collection daemon
collectd behaves. The most significant option is LoadPlugin, which
controls which plugins to load. These plugins ultimately define
collectd's behavior. If the AutoLoadPlugin option has been enabled, the
explicit LoadPlugin lines may be omitted for all plugins with a
configuration block, i.e. a "<Plugin ...>" block.

The syntax of this config file is similar to the config file of the
famous Apache webserver. Each line contains either an option (a key and
a list of one or more values) or a section-start or -end. Empty lines
and everything after a non-quoted hash-symbol ("#") are ignored. Keys
are unquoted strings, consisting only of alphanumeric characters and
the underscore ("_") character. Keys are handled case insensitive by
collectd itself and all plugins included with it. Values can either be
an unquoted string, a quoted string (enclosed in double-quotes) a
number or a boolean expression. Unquoted strings consist of only
alphanumeric characters and underscores ("_") and do not need to be
quoted. Quoted strings are enclosed in double quotes ("""). You can use
the backslash character ("\") to include double quotes as part of the
string. Numbers can be specified in decimal and floating point format
(using a dot "." as decimal separator), hexadecimal when using the "0x"
prefix and octal with a leading zero (0). Boolean values are either
true or false.

Lines may be wrapped by using "\" as the last character before the
newline. This allows long lines to be split into multiple lines.
Quoted strings may be wrapped as well. However, those are treated
special in that whitespace at the beginning of the following lines will
be ignored, which allows for nicely indenting the wrapped lines.

The configuration is read and processed in order, i.e. from top to
bottom. So the plugins are loaded in the order listed in this config
file. It is a good idea to load any logging plugins first in order to
catch messages from plugins during configuration. Also, unless
AutoLoadPlugin is enabled, the LoadPlugin option must occur before the
appropriate "<Plugin ...>" block.

GLOBAL OPTIONS
BaseDir Directory
Sets the base directory. This is the directory beneath which all
RRD-files are created. Possibly more subdirectories are created.
This is also the working directory for the daemon.

LoadPlugin Plugin
Loads the plugin Plugin. This is required to load plugins, unless
the AutoLoadPlugin option is enabled (see below). Without any
loaded plugins, collectd will be mostly useless.

Only the first LoadPlugin statement or block for a given plugin
name has any effect. This is useful when you want to split up the
configuration into smaller files and want each file to be "self
contained", i.e. it contains a Plugin block and the appropriate
LoadPlugin statement. The downside is that if you have multiple
conflicting LoadPlugin blocks, e.g. when they specify different
intervals, only one of them (the first one encountered) will take
effect and all others will be silently ignored.

LoadPlugin may either be a simple configuration statement or a
block with additional options, affecting the behavior of
LoadPlugin. A simple statement looks like this:

LoadPlugin "cpu"

Options inside a LoadPlugin block can override default settings and
influence the way plugins are loaded, e.g.:

<LoadPlugin perl>
Interval 60
</LoadPlugin>

The following options are valid inside LoadPlugin blocks:

Globals true|false
If enabled, collectd will export all global symbols of the
plugin (and of all libraries loaded as dependencies of the
plugin) and, thus, makes those symbols available for resolving
unresolved symbols in subsequently loaded plugins if that is
supported by your system.

This is useful (or possibly even required), e.g., when loading
a plugin that embeds some scripting language into the daemon
(e.g. the Perl and Python plugins). Scripting languages usually
provide means to load extensions written in C. Those extensions
require symbols provided by the interpreter, which is loaded as
a dependency of the respective collectd plugin. See the
documentation of those plugins (e.g., collectd-perl(5) or
collectd-python(5)) for details.

By default, this is disabled. As a special exception, if the
plugin name is either "perl" or "python", the default is
changed to enabled in order to keep the average user from ever
having to deal with this low level linking stuff.

Interval Seconds
Sets a plugin-specific interval for collecting metrics. This
overrides the global Interval setting. If a plugin provides its
own support for specifying an interval, that setting will take
precedence.

FlushInterval Seconds
Specifies the interval, in seconds, to call the flush callback
if it's defined in this plugin. By default, this is disabled.

FlushTimeout Seconds
Specifies the value of the timeout argument of the flush
callback.

AutoLoadPlugin false|true
When set to false (the default), each plugin needs to be loaded
explicitly, using the LoadPlugin statement documented above. If a
<Plugin ...> block is encountered and no configuration handling
callback for this plugin has been registered, a warning is logged
and the block is ignored.

When set to true, explicit LoadPlugin statements are not required.
Each <Plugin ...> block acts as if it was immediately preceded by a
LoadPlugin statement. LoadPlugin statements are still required for
plugins that don't provide any configuration, e.g. the Load plugin.

CollectInternalStats false|true
When set to true, various statistics about the collectd daemon will
be collected, with "collectd" as the plugin name. Defaults to
false.

The following metrics are reported:

"collectd-write_queue/queue_length"
The number of metrics currently in the write queue. You can
limit the queue length with the WriteQueueLimitLow and
WriteQueueLimitHigh options.

"collectd-write_queue/derive-dropped"
The number of metrics dropped due to a queue length limitation.
If this value is non-zero, your system can't handle all
incoming metrics and protects itself against overload by
dropping metrics.

"collectd-cache/cache_size"
The number of elements in the metric cache (the cache you can
interact with using collectd-unixsock(5)).

Include Path [pattern]
If Path points to a file, includes that file. If Path points to a
directory, recursively includes all files within that directory and
its subdirectories. If the "wordexp" function is available on your
system, shell-like wildcards are expanded before files are
included. This means you can use statements like the following:

Include "/etc/collectd.d/*.conf"

Starting with version 5.3, this may also be a block in which
further options affecting the behavior of Include may be specified.
The following option is currently allowed:

<Include "/etc/collectd.d">
Filter "*.conf"
</Include>

Filter pattern
If the "fnmatch" function is available on your system, a shell-
like wildcard pattern may be specified to filter which files to
include. This may be used in combination with recursively
including a directory to easily be able to arbitrarily mix
configuration files and other documents (e.g. README files).
The given example is similar to the first example above but
includes all files matching "*.conf" in any subdirectory of
"/etc/collectd.d".

If more than one file is included by a single Include option, the
files will be included in lexicographical order (as defined by the
"strcmp" function). Thus, you can e. g. use numbered prefixes to
specify the order in which the files are loaded.

To prevent loops and shooting yourself in the foot in interesting
ways the nesting is limited to a depth of 8 levels, which should be
sufficient for most uses. Since symlinks are followed it is still
possible to crash the daemon by looping symlinks. In our opinion
significant stupidity should result in an appropriate amount of
pain.

It is no problem to have a block like "<Plugin foo>" in more than
one file, but you cannot include files from within blocks.

PIDFile File
Sets where to write the PID file to. This file is overwritten when
it exists and deleted when the program is stopped. Some init-
scripts might override this setting using the -P command-line
option.

PluginDir Directory
Path to the plugins (shared objects) of collectd.

TypesDB File [File ...]
Set one or more files that contain the data-set descriptions. See
types.db(5) for a description of the format of this file.

If this option is not specified, a default file is read. If you
need to define custom types in addition to the types defined in the
default file, you need to explicitly load both. In other words, if
the TypesDB option is encountered the default behavior is disabled
and if you need the default types you have to also explicitly load
them.

Interval Seconds
Configures the interval in which to query the read plugins.
Obviously smaller values lead to a higher system load produced by
collectd, while higher values lead to more coarse statistics.

Warning: You should set this once and then never touch it again. If
you do, you will have to delete all your RRD files or know some
serious RRDtool magic! (Assuming you're using the RRDtool or
RRDCacheD plugin.)

MaxReadInterval Seconds
A read plugin doubles the interval between queries after each
failed attempt to get data.

This options limits the maximum value of the interval. The default
value is 86400.

Timeout Iterations
Consider a value list "missing" when no update has been read or
received for Iterations iterations. By default, collectd considers
a value list missing when no update has been received for twice the
update interval. Since this setting uses iterations, the maximum
allowed time without update depends on the Interval information
contained in each value list. This is used in the Threshold
configuration to dispatch notifications about missing values, see
collectd-threshold(5) for details.

ReadThreads Num
Number of threads to start for reading plugins. The default value
is 5, but you may want to increase this if you have more than five
plugins that take a long time to read. Mostly those are plugins
that do network-IO. Setting this to a value higher than the number
of registered read callbacks is not recommended.

WriteThreads Num
Number of threads to start for dispatching value lists to write
plugins. The default value is 5, but you may want to increase this
if you have more than five plugins that may take relatively long to
write to.

WriteQueueLimitHigh HighNum
WriteQueueLimitLow LowNum
Metrics are read by the read threads and then put into a queue to
be handled by the write threads. If one of the write plugins is
slow (e.g. network timeouts, I/O saturation of the disk) this queue
will grow. In order to avoid running into memory issues in such a
case, you can limit the size of this queue.

By default, there is no limit and memory may grow indefinitely.
This is most likely not an issue for clients, i.e. instances that
only handle the local metrics. For servers it is recommended to set
this to a non-zero value, though.

You can set the limits using WriteQueueLimitHigh and
WriteQueueLimitLow. Each of them takes a numerical argument which
is the number of metrics in the queue. If there are HighNum metrics
in the queue, any new metrics will be dropped. If there are less
than LowNum metrics in the queue, all new metrics will be enqueued.
If the number of metrics currently in the queue is between LowNum
and HighNum, the metric is dropped with a probability that is
proportional to the number of metrics in the queue (i.e. it
increases linearly until it reaches 100%.)

If WriteQueueLimitHigh is set to non-zero and WriteQueueLimitLow is
unset, the latter will default to half of WriteQueueLimitHigh.

If you do not want to randomly drop values when the queue size is
between LowNum and HighNum, set WriteQueueLimitHigh and
WriteQueueLimitLow to the same value.

Enabling the CollectInternalStats option is of great help to figure
out the values to set WriteQueueLimitHigh and WriteQueueLimitLow
to.

Hostname Name
Sets the hostname that identifies a host. If you omit this setting,
the hostname will be determined using the gethostname(2) system
call.

FQDNLookup true|false
If Hostname is determined automatically this setting controls
whether or not the daemon should try to figure out the "fully
qualified domain name", FQDN. This is done using a lookup of the
name returned by "gethostname". This option is enabled by default.

PreCacheChain ChainName
PostCacheChain ChainName
Configure the name of the "pre-cache chain" and the "post-cache
chain". Please see "FILTER CONFIGURATION" below on information on
chains and how these setting change the daemon's behavior.

PLUGIN OPTIONS
Some plugins may register own options. These options must be enclosed
in a "Plugin"-Section. Which options exist depends on the plugin used.
Some plugins require external configuration, too. The "apache plugin",
for example, required "mod_status" to be configured in the webserver
you're going to collect data from. These plugins are listed below as
well, even if they don't require any configuration within collectd's
configuration file.

A list of all plugins and a short summary for each plugin can be found
in the README file shipped with the sourcecode and hopefully binary
packets as well.

Plugin "aggregation"
The Aggregation plugin makes it possible to aggregate several values
into one using aggregation functions such as sum, average, min and max.
This can be put to a wide variety of uses, e.g. average and total CPU
statistics for your entire fleet.

The grouping is powerful but, as with many powerful tools, may be a bit
difficult to wrap your head around. The grouping will therefore be
demonstrated using an example: The average and sum of the CPU usage
across all CPUs of each host is to be calculated.

To select all the affected values for our example, set "Plugin cpu" and
"Type cpu". The other values are left unspecified, meaning "all
values". The Host, Plugin, PluginInstance, Type and TypeInstance
options work as if they were specified in the "WHERE" clause of an
"SELECT" SQL statement.

Plugin "cpu"
Type "cpu"

Although the Host, PluginInstance (CPU number, i.e. 0, 1, 2, ...) and
TypeInstance (idle, user, system, ...) fields are left unspecified in
the example, the intention is to have a new value for each host / type
instance pair. This is achieved by "grouping" the values using the
"GroupBy" option. It can be specified multiple times to group by more
than one field.

GroupBy "Host"
GroupBy "TypeInstance"

We do neither specify nor group by plugin instance (the CPU number), so
all metrics that differ in the CPU number only will be aggregated. Each
aggregation needs at least one such field, otherwise no aggregation
would take place.

The full example configuration looks like this:

<Plugin "aggregation">
<Aggregation>
Plugin "cpu"
Type "cpu"

GroupBy "Host"
GroupBy "TypeInstance"

CalculateSum true
CalculateAverage true
</Aggregation>
</Plugin>

There are a couple of limitations you should be aware of:

• The Type cannot be left unspecified, because it is not reasonable
to add apples to oranges. Also, the internal lookup structure won't
work if you try to group by type.

• There must be at least one unspecified, ungrouped field. Otherwise
nothing will be aggregated.

As you can see in the example above, each aggregation has its own
Aggregation block. You can have multiple aggregation blocks and
aggregation blocks may match the same values, i.e. one value list can
update multiple aggregations. The following options are valid inside
Aggregation blocks:

Host Host
Plugin Plugin
PluginInstance PluginInstance
Type Type
TypeInstance TypeInstance
Selects the value lists to be added to this aggregation. Type must
be a valid data set name, see types.db(5) for details.

If the string starts with and ends with a slash ("/"), the string
is interpreted as a regular expression. The regex flavor used are
POSIX extended regular expressions as described in regex(7).
Example usage:

Host "/^db[0-9]\\.example\\.com$/"

GroupBy Host|Plugin|PluginInstance|TypeInstance
Group valued by the specified field. The GroupBy option may be
repeated to group by multiple fields.

SetHost Host
SetPlugin Plugin
SetPluginInstance PluginInstance
SetTypeInstance TypeInstance
Sets the appropriate part of the identifier to the provided string.

The PluginInstance should include the placeholder "%{aggregation}"
which will be replaced with the aggregation function, e.g.
"average". Not including the placeholder will result in duplication
warnings and/or messed up values if more than one aggregation
function are enabled.

The following example calculates the average usage of all "even"
CPUs:

<Plugin "aggregation">
<Aggregation>
Plugin "cpu"
PluginInstance "/[0,2,4,6,8]$/"
Type "cpu"

SetPlugin "cpu"
SetPluginInstance "even-%{aggregation}"

GroupBy "Host"
GroupBy "TypeInstance"

CalculateAverage true
</Aggregation>
</Plugin>

This will create the files:

• foo.example.com/cpu-even-average/cpu-idle

• foo.example.com/cpu-even-average/cpu-system

• foo.example.com/cpu-even-average/cpu-user

• ...

CalculateNum true|false
CalculateSum true|false
CalculateAverage true|false
CalculateMinimum true|false
CalculateMaximum true|false
CalculateStddev true|false
Boolean options for enabling calculation of the number of value
lists, their sum, average, minimum, maximum and / or standard
deviation. All options are disabled by default.

Plugin "amqp"
The AMQP plugin can be used to communicate with other instances of
collectd or third party applications using an AMQP 0.9.1 message
broker. Values are sent to or received from the broker, which handles
routing, queueing and possibly filtering out messages.

Synopsis:

<Plugin "amqp">
# Send values to an AMQP broker
<Publish "some_name">
Host "localhost"
Host "fallback-amqp.example.com"
Port "5672"
VHost "/"
User "guest"
Password "guest"
Exchange "amq.fanout"
# ExchangeType "fanout"
# RoutingKey "collectd"
# Persistent false
# ConnectionRetryDelay 0
# Format "command"
# StoreRates false
# TLSEnabled false
# TLSVerifyPeer true
# TLSVerifyHostName true
# TLSCACert "/path/to/ca.pem"
# TLSClientCert "/path/to/client-cert.pem"
# TLSClientKey "/path/to/client-key.pem"
# GraphitePrefix "collectd."
# GraphiteEscapeChar "_"
# GraphiteSeparateInstances false
# GraphiteAlwaysAppendDS false
# GraphitePreserveSeparator false
</Publish>

# Receive values from an AMQP broker
<Subscribe "some_name">
Host "localhost"
Port "5672"
VHost "/"
User "guest"
Password "guest"
Exchange "amq.fanout"
# ExchangeType "fanout"
# Queue "queue_name"
# QueueDurable false
# QueueAutoDelete true
# RoutingKey "collectd.#"
# ConnectionRetryDelay 0
# TLSEnabled false
# TLSVerifyPeer true
# TLSVerifyHostName true
# TLSCACert "/path/to/ca.pem"
# TLSClientCert "/path/to/client-cert.pem"
# TLSClientKey "/path/to/client-key.pem"
</Subscribe>
</Plugin>

The plugin's configuration consists of a number of Publish and
Subscribe blocks, which configure sending and receiving of values
respectively. The two blocks are very similar, so unless otherwise
noted, an option can be used in either block. The name given in the
blocks starting tag is only used for reporting messages, but may be
used to support flushing of certain Publish blocks in the future.

Host Host [Host ...]
Hostname or IP-address of the AMQP broker. Defaults to the default
behavior of the underlying communications library, rabbitmq-c,
which is "localhost".

If multiple hosts are specified, then a random one is chosen at
each (re)connection attempt. This is useful for failover with a
clustered broker.

Port Port
Service name or port number on which the AMQP broker accepts
connections. This argument must be a string, even if the numeric
form is used. Defaults to "5672".

VHost VHost
Name of the virtual host on the AMQP broker to use. Defaults to
"/".

User User
Password Password
Credentials used to authenticate to the AMQP broker. By default
"guest"/"guest" is used.

Exchange Exchange
In Publish blocks, this option specifies the exchange to send
values to. By default, "amq.fanout" will be used.

In Subscribe blocks this option is optional. If given, a binding
between the given exchange and the queue is created, using the
routing key if configured. See the Queue and RoutingKey options
below.

ExchangeType Type
If given, the plugin will try to create the configured exchange
with this type after connecting. When in a Subscribe block, the
queue will then be bound to this exchange.

Queue Queue (Subscribe only)
Configures the queue name to subscribe to. If no queue name was
configured explicitly, a unique queue name will be created by the
broker.

QueueDurable true|false (Subscribe only)
Defines if the queue subscribed to is durable (saved to persistent
storage) or transient (will disappear if the AMQP broker is
restarted). Defaults to "false".

This option should be used in conjunction with the Persistent
option on the publish side.

QueueAutoDelete true|false (Subscribe only)
Defines if the queue subscribed to will be deleted once the last
consumer unsubscribes. Defaults to "true".

RoutingKey Key
In Publish blocks, this configures the routing key to set on all
outgoing messages. If not given, the routing key will be computed
from the identifier of the value. The host, plugin, type and the
two instances are concatenated together using dots as the separator
and all containing dots replaced with slashes. For example
"collectd.host/example/com.cpu.0.cpu.user". This makes it possible
to receive only specific values using a "topic" exchange.

In Subscribe blocks, configures the routing key used when creating
a binding between an exchange and the queue. The usual wildcards
can be used to filter messages when using a "topic" exchange. If
you're only interested in CPU statistics, you could use the routing
key "collectd.*.cpu.#" for example.

Persistent true|false (Publish only)
Selects the delivery method to use. If set to true, the persistent
mode will be used, i.e. delivery is guaranteed. If set to false
(the default), the transient delivery mode will be used, i.e.
messages may be lost due to high load, overflowing queues or
similar issues.

ConnectionRetryDelay Delay
When the connection to the AMQP broker is lost, defines the time in
seconds to wait before attempting to reconnect. Defaults to 0,
which implies collectd will attempt to reconnect at each read
interval (in Subscribe mode) or each time values are ready for
submission (in Publish mode).

Format Command|JSON|Graphite (Publish only)
Selects the format in which messages are sent to the broker. If set
to Command (the default), values are sent as "PUTVAL" commands
which are identical to the syntax used by the Exec and UnixSock
plugins. In this case, the "Content-Type" header field will be set
to "text/collectd".

If set to JSON, the values are encoded in the JavaScript Object
Notation, an easy and straight forward exchange format. The
"Content-Type" header field will be set to "application/json".

If set to Graphite, values are encoded in the Graphite format,
which is "<metric> <value> <timestamp>\n". The "Content-Type"
header field will be set to "text/graphite".

A subscribing client should use the "Content-Type" header field to
determine how to decode the values. Currently, the AMQP plugin
itself can only decode the Command format.

StoreRates true|false (Publish only)
Determines whether or not "COUNTER", "DERIVE" and "ABSOLUTE" data
sources are converted to a rate (i.e. a "GAUGE" value). If set to
false (the default), no conversion is performed. Otherwise the
conversion is performed using the internal value cache.

Please note that currently this option is only used if the Format
option has been set to JSON.

GraphitePrefix (Publish and Format=Graphite only)
A prefix can be added in the metric name when outputting in the
Graphite format. It's added before the Host name. Metric name
will be "<prefix><host><postfix><plugin><type><name>"

GraphitePostfix (Publish and Format=Graphite only)
A postfix can be added in the metric name when outputting in the
Graphite format. It's added after the Host name. Metric name will
be "<prefix><host><postfix><plugin><type><name>"

GraphiteEscapeChar (Publish and Format=Graphite only)
Specify a character to replace dots (.) in the host part of the
metric name. In Graphite metric name, dots are used as separators
between different metric parts (host, plugin, type). Default is
"_" (Underscore).

GraphiteSeparateInstances true|false
If set to true, the plugin instance and type instance will be in
their own path component, for example "host.cpu.0.cpu.idle". If set
to false (the default), the plugin and plugin instance (and
likewise the type and type instance) are put into one component,
for example "host.cpu-0.cpu-idle".

GraphiteAlwaysAppendDS true|false
If set to true, append the name of the Data Source (DS) to the
"metric" identifier. If set to false (the default), this is only
done when there is more than one DS.

GraphitePreserveSeparator false|true
If set to false (the default) the "." (dot) character is replaced
with GraphiteEscapeChar. Otherwise, if set to true, the "." (dot)
character is preserved, i.e. passed through.

TLSEnabled true|false
If set to true then connect to the broker using a TLS connection.
If set to false (the default), then a plain text connection is
used.

Requires rabbitmq-c >= 0.4.

TLSVerifyPeer true|false
If set to true (the default) then the server certificate chain is
verified. Setting this to false will skip verification (insecure).

Requires rabbitmq-c >= 0.8.

TLSVerifyHostName true|false
If set to true (the default) then the server host name is verified.
Setting this to false will skip verification (insecure).

Requires rabbitmq-c >= 0.8.

TLSCACert Path
Path to the CA cert file in PEM format.

TLSClientCert Path
Path to the client certificate in PEM format. If this is set, then
TLSClientKey must be set as well.

TLSClientKey Path
Path to the client key in PEM format. If this is set, then
TLSClientCert must be set as well.

Plugin "amqp1"
The AMQP1 plugin can be used to communicate with other instances of
collectd or third party applications using an AMQP 1.0 message
intermediary. Metric values or notifications are sent to the messaging
intermediary which may handle direct messaging or queue based transfer.

Synopsis:

<Plugin "amqp1">
# Send values to an AMQP 1.0 intermediary
<Transport "name">
Host "localhost"
Port "5672"
User "guest"
Password "guest"
Address "collectd"
# RetryDelay 1
<Instance "some_name">
Format "command"
PreSettle false
Notify false
# StoreRates false
# GraphitePrefix "collectd."
# GraphiteEscapeChar "_"
# GraphiteSeparateInstances false
# GraphiteAlwaysAppendDS false
# GraphitePreserveSeparator false
</Instance>
</Transport>
</Plugin>

The plugin's configuration consists of a Transport that configures
communications to the AMQP 1.0 messaging bus and one or more Instance
corresponding to metric or event publishers to the messaging system.

The address in the Transport block concatenated with the name given in
the Instance block starting tag will be used as the send-to address for
communications over the messaging link.

The following options are accepted within each Transport block:

Host Host
Hostname or IP-address of the AMQP 1.0 intermediary. Defaults to
the default behavior of the underlying communications library,
libqpid-proton, which is "localhost".

Port Port
Service name or port number on which the AMQP 1.0 intermediary
accepts connections. This argument must be a string, even if the
numeric form is used. Defaults to "5672".

User User
Password Password
Credentials used to authenticate to the AMQP 1.0 intermediary. By
default "guest"/"guest" is used.

Address Address
This option specifies the prefix for the send-to value in the
message. By default, "collectd" will be used.

RetryDelay RetryDelay
When the AMQP1 connection is lost, defines the time in seconds to
wait before attempting to reconnect. Defaults to 1, which implies
attempt to reconnect at 1 second intervals.

SendQueueLimit SendQueueLimit If there is no AMQP1 connection, the
plugin will continue to queue messages to send, which could result in
unbounded memory consumption. This parameter is used to limit the
number of messages in the outbound queue to the specified value. The
default value is 0, which disables this feature.

The following options are accepted within each Instance block:

Format Command|JSON|Graphite
Selects the format in which messages are sent to the intermediary.
If set to Command (the default), values are sent as "PUTVAL"
commands which are identical to the syntax used by the Exec and
UnixSock plugins. In this case, the "Content-Type" header field
will be set to "text/collectd".

If set to JSON, the values are encoded in the JavaScript Object
Notation, an easy and straight forward exchange format. The
"Content-Type" header field will be set to "application/json".

If set to Graphite, values are encoded in the Graphite format,
which is "<metric> <value> <timestamp>\n". The "Content-Type"
header field will be set to "text/graphite".

A subscribing client should use the "Content-Type" header field to
determine how to decode the values.

PreSettle true|false
If set to false (the default), the plugin will wait for a message
acknowledgement from the messaging bus before sending the next
message. This indicates transfer of ownership to the messaging
system. If set to true, the plugin will not wait for a message
acknowledgement and the message may be dropped prior to transfer of
ownership.

Notify true|false
If set to false (the default), the plugin will service the instance
write call back as a value list. If set to true the plugin will
service the instance as a write notification callback for alert
formatting.

StoreRates true|false
Determines whether or not "COUNTER", "DERIVE" and "ABSOLUTE" data
sources are converted to a rate (i.e. a "GAUGE" value). If set to
false (the default), no conversion is performed. Otherwise the
conversion is performed using the internal value cache.

Please note that currently this option is only used if the Format
option has been set to JSON.

GraphitePrefix
A prefix can be added in the metric name when outputting in the
Graphite format. It's added before the Host name. Metric name
will be "<prefix><host><postfix><plugin><type><name>"

GraphitePostfix
A postfix can be added in the metric name when outputting in the
Graphite format. It's added after the Host name. Metric name will
be "<prefix><host><postfix><plugin><type><name>"

GraphiteEscapeChar
Specify a character to replace dots (.) in the host part of the
metric name. In Graphite metric name, dots are used as separators
between different metric parts (host, plugin, type). Default is
"_" (Underscore).

GraphiteAlwaysAppendDS true|false
If set to true, append the name of the Data Source (DS) to the
"metric" identifier. If set to false (the default), this is only
done when there is more than one DS.

Plugin "apache"
To configure the "apache"-plugin you first need to configure the Apache
webserver correctly. The Apache-plugin "mod_status" needs to be loaded
and working and the "ExtendedStatus" directive needs to be enabled. You
can use the following snipped to base your Apache config upon:

ExtendedStatus on
<IfModule mod_status.c>
<Location /mod_status>
SetHandler server-status
</Location>
</IfModule>

Since its "mod_status" module is very similar to Apache's, lighttpd is
also supported. It introduces a new field, called "BusyServers", to
count the number of currently connected clients. This field is also
supported.

The configuration of the Apache plugin consists of one or more
"<Instance />" blocks. Each block requires one string argument as the
instance name. For example:

<Plugin "apache">
<Instance "www1">
URL "http://www1.example.com/mod_status?auto"
</Instance>
<Instance "www2">
URL "http://www2.example.com/mod_status?auto"
</Instance>
</Plugin>

The instance name will be used as the plugin instance. To emulate the
old (version 4) behavior, you can use an empty string (""). In order
for the plugin to work correctly, each instance name must be unique.
This is not enforced by the plugin and it is your responsibility to
ensure it.

The following options are accepted within each Instance block:

URL http://host/mod_status?auto
Sets the URL of the "mod_status" output. This needs to be the
output generated by "ExtendedStatus on" and it needs to be the
machine readable output generated by appending the "?auto"
argument. This option is mandatory.

User Username
Optional user name needed for authentication.

Password Password
Optional password needed for authentication.

VerifyPeer true|false
Enable or disable peer SSL certificate verification. See
<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by
default.

VerifyHost true|false
Enable or disable peer host name verification. If enabled, the
plugin checks if the "Common Name" or a "Subject Alternate Name"
field of the SSL certificate matches the host name provided by the
URL option. If this identity check fails, the connection is
aborted. Obviously, only works when connecting to a SSL enabled
server. Enabled by default.

CACert File
File that holds one or more SSL certificates. If you want to use
HTTPS you will possibly need this option. What CA certificates come
bundled with "libcurl" and are checked by default depends on the
distribution you use.

SSLCiphers list of ciphers
Specifies which ciphers to use in the connection. The list of
ciphers must specify valid ciphers. See
<http://www.openssl.org/docs/apps/ciphers.html> for details.

Timeout Milliseconds
The Timeout option sets the overall timeout for HTTP requests to
URL, in milliseconds. By default, the configured Interval is used
to set the timeout.

Plugin "apcups"
Host Hostname
Hostname of the host running apcupsd. Defaults to localhost. Please
note that IPv6 support has been disabled unless someone can confirm
or decline that apcupsd can handle it.

Port Port
TCP-Port to connect to. Defaults to 3551.

ReportSeconds true|false
If set to true, the time reported in the "timeleft" metric will be
converted to seconds. This is the recommended setting. If set to
false, the default for backwards compatibility, the time will be
reported in minutes.

PersistentConnection true|false
The plugin is designed to keep the connection to apcupsd open
between reads. If plugin poll interval is greater than 15 seconds
(hardcoded socket close timeout in apcupsd NIS), then this option
is false by default.

You can instruct the plugin to close the connection after each read
by setting this option to false or force keeping the connection by
setting it to true.

If apcupsd appears to close the connection due to inactivity quite
quickly, the plugin will try to detect this problem and switch to
an open-read-close mode.

Plugin "aquaero"
This plugin collects the value of the available sensors in an Aquaero 5
board. Aquaero 5 is a water-cooling controller board, manufactured by
Aqua Computer GmbH <http://www.aquacomputer.de/>, with a USB2
connection for monitoring and configuration. The board can handle
multiple temperature sensors, fans, water pumps and water level sensors
and adjust the output settings such as fan voltage or power used by the
water pump based on the available inputs using a configurable
controller included in the board. This plugin collects all the
available inputs as well as some of the output values chosen by this
controller. The plugin is based on the libaquaero5 library provided by
aquatools-ng.

Device DevicePath
Device path of the Aquaero 5's USB HID (human interface device),
usually in the form "/dev/usb/hiddevX". If this option is no set
the plugin will try to auto-detect the Aquaero 5 USB device based
on vendor-ID and product-ID.

Plugin "ascent"
This plugin collects information about an Ascent server, a free server
for the "World of Warcraft" game. This plugin gathers the information
by fetching the XML status page using "libcurl" and parses it using
"libxml2".

The configuration options are the same as for the "apache" plugin
above:

URL http://localhost/ascent/status/
Sets the URL of the XML status output.

User Username
Optional user name needed for authentication.

Password Password
Optional password needed for authentication.

VerifyPeer true|false
Enable or disable peer SSL certificate verification. See
<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by
default.

Timeout Milliseconds
The Timeout option sets the overall timeout for HTTP requests to
URL, in milliseconds. By default, the configured Interval is used
to set the timeout.

Plugin "barometer"
This plugin reads absolute air pressure using digital barometer sensor
on a I2C bus. Supported sensors are:

MPL115A2 from Freescale, see
<http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPL115A>.
MPL3115 from Freescale see
<http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPL3115A2>.
BMP085 from Bosch Sensortec

The sensor type - one of the above - is detected automatically by the
plugin and indicated in the plugin_instance (you will see subdirectory
"barometer-mpl115" or "barometer-mpl3115", or "barometer-bmp085"). The
order of detection is BMP085 -> MPL3115 -> MPL115A2, the first one
found will be used (only one sensor can be used by the plugin).

The plugin provides absolute barometric pressure, air pressure reduced
to sea level (several possible approximations) and as an auxiliary
value also internal sensor temperature. It uses (expects/provides)
typical metric units - pressure in [hPa], temperature in [C], altitude
in [m].

It was developed and tested under Linux only. The only platform
dependency is the standard Linux i2c-dev interface (the particular bus
driver has to support the SM Bus command subset).

The reduction or normalization to mean sea level pressure requires
(depending on selected method/approximation) also altitude and
reference to temperature sensor(s). When multiple temperature sensors
are configured the minimum of their values is always used (expecting
that the warmer ones are affected by e.g. direct sun light at that
moment).

Synopsis:

<Plugin "barometer">
Device "/dev/i2c-0";
Oversampling 512
PressureOffset 0.0
TemperatureOffset 0.0
Normalization 2
Altitude 238.0
TemperatureSensor "myserver/onewire-F10FCA000800/temperature"
</Plugin>

Device device
The only mandatory configuration parameter.

Device name of the I2C bus to which the sensor is connected. Note
that typically you need to have loaded the i2c-dev module. Using
i2c-tools you can check/list i2c buses available on your system by:

i2cdetect -l

Then you can scan for devices on given bus. E.g. to scan the whole
bus 0 use:

i2cdetect -y -a 0

This way you should be able to verify that the pressure sensor
(either type) is connected and detected on address 0x60.

Oversampling value
Optional parameter controlling the oversampling/accuracy. Default
value is 1 providing fastest and least accurate reading.

For MPL115 this is the size of the averaging window. To filter out
sensor noise a simple averaging using floating window of this
configurable size is used. The plugin will use average of the last
"value" measurements (value of 1 means no averaging). Minimal size
is 1, maximal 1024.

For MPL3115 this is the oversampling value. The actual oversampling
is performed by the sensor and the higher value the higher accuracy
and longer conversion time (although nothing to worry about in the
collectd context). Supported values are: 1, 2, 4, 8, 16, 32, 64
and 128. Any other value is adjusted by the plugin to the closest
supported one.

For BMP085 this is the oversampling value. The actual oversampling
is performed by the sensor and the higher value the higher accuracy
and longer conversion time (although nothing to worry about in the
collectd context). Supported values are: 1, 2, 4, 8. Any other
value is adjusted by the plugin to the closest supported one.

PressureOffset offset
Optional parameter for MPL3115 only.

You can further calibrate the sensor by supplying pressure and/or
temperature offsets. This is added to the measured/caclulated
value (i.e. if the measured value is too high then use negative
offset). In hPa, default is 0.0.

TemperatureOffset offset
Optional parameter for MPL3115 only.

Normalization method
Optional parameter, default value is 0.

Normalization method - what approximation/model is used to compute
the mean sea level pressure from the air absolute pressure.

Supported values of the "method" (integer between from 0 to 2) are:

0 - no conversion, absolute pressure is simply copied over. For
this method you do not need to configure "Altitude" or
"TemperatureSensor".
1 - international formula for conversion , See
<http://en.wikipedia.org/wiki/Atmospheric_pressure#Altitude_atmospheric_pressure_variation>.
For this method you have to configure "Altitude" but do not need
"TemperatureSensor" (uses fixed global temperature average
instead).
2 - formula as recommended by the Deutsche Wetterdienst (German
Meteorological Service). See
<http://de.wikipedia.org/wiki/Barometrische_H%C3%B6henformel#Theorie>
For this method you have to configure both "Altitude" and
"TemperatureSensor".
Altitude altitude
The altitude (in meters) of the location where you meassure the
pressure.

TemperatureSensor reference
Temperature sensor(s) which should be used as a reference when
normalizing the pressure using "Normalization" method 2. When
specified more sensors a minimum is found and used each time. The
temperature reading directly from this pressure sensor/plugin is
typically not suitable as the pressure sensor will be probably
inside while we want outside temperature. The collectd reference
name is something like
<hostname>/<plugin_name>-<plugin_instance>/<type>-<type_instance>
(<type_instance> is usually omitted when there is just single value
type). Or you can figure it out from the path of the output data
files.

Plugin "battery"
The battery plugin reports the remaining capacity, power and voltage of
laptop batteries.

ValuesPercentage false|true
When enabled, remaining capacity is reported as a percentage, e.g.
"42% capacity remaining". Otherwise the capacity is stored as
reported by the battery, most likely in "Wh". This option does not
work with all input methods, in particular when only "/proc/pmu" is
available on an old Linux system. Defaults to false.

ReportDegraded false|true
Typical laptop batteries degrade over time, meaning the capacity
decreases with recharge cycles. The maximum charge of the previous
charge cycle is tracked as "last full capacity" and used to
determine that a battery is "fully charged".

When this option is set to false, the default, the battery plugin
will only report the remaining capacity. If the ValuesPercentage
option is enabled, the relative remaining capacity is calculated as
the ratio of the "remaining capacity" and the "last full capacity".
This is what most tools, such as the status bar of desktop
environments, also do.

When set to true, the battery plugin will report three values:
charged (remaining capacity), discharged (difference between "last
full capacity" and "remaining capacity") and degraded (difference
between "design capacity" and "last full capacity").

QueryStateFS false|true
When set to true, the battery plugin will only read statistics
related to battery performance as exposed by StateFS at /run/state.
StateFS is used in Mer-based Sailfish OS, for example.

Plugin "bind"
Starting with BIND 9.5.0, the most widely used DNS server software
provides extensive statistics about queries, responses and lots of
other information. The bind plugin retrieves this information that's
encoded in XML and provided via HTTP and submits the values to
collectd.

To use this plugin, you first need to tell BIND to make this
information available. This is done with the "statistics-channels"
configuration option:

statistics-channels {
inet localhost port 8053;
};

The configuration follows the grouping that can be seen when looking at
the data with an XSLT compatible viewer, such as a modern web browser.
It's probably a good idea to make yourself familiar with the provided
values, so you can understand what the collected statistics actually
mean.

Synopsis:

<Plugin "bind">
URL "http://localhost:8053/"
ParseTime false
OpCodes true
QTypes true

ServerStats true
ZoneMaintStats true
ResolverStats false
MemoryStats true

<View "_default">
QTypes true
ResolverStats true
CacheRRSets true

Zone "127.in-addr.arpa/IN"
</View>
</Plugin>

The bind plugin accepts the following configuration options:

URL URL
URL from which to retrieve the XML data. If not specified,
"http://localhost:8053/" will be used.

ParseTime true|false
When set to true, the time provided by BIND will be parsed and used
to dispatch the values. When set to false, the local time source is
queried.

This setting is set to true by default for backwards compatibility;
setting this to false is recommended to avoid problems with
timezones and localization.

OpCodes true|false
When enabled, statistics about the "OpCodes", for example the
number of "QUERY" packets, are collected.

Default: Enabled.

QTypes true|false
When enabled, the number of incoming queries by query types (for
example "A", "MX", "AAAA") is collected.

Default: Enabled.

ServerStats true|false
Collect global server statistics, such as requests received over
IPv4 and IPv6, successful queries, and failed updates.

Default: Enabled.

ZoneMaintStats true|false
Collect zone maintenance statistics, mostly information about
notifications (zone updates) and zone transfers.

Default: Enabled.

ResolverStats true|false
Collect resolver statistics, i. e. statistics about outgoing
requests (e. g. queries over IPv4, lame servers). Since the global
resolver counters apparently were removed in BIND 9.5.1 and 9.6.0,
this is disabled by default. Use the ResolverStats option within a
View "_default" block instead for the same functionality.

Default: Disabled.

MemoryStats
Collect global memory statistics.

Default: Enabled.

Timeout Milliseconds
The Timeout option sets the overall timeout for HTTP requests to
URL, in milliseconds. By default, the configured Interval is used
to set the timeout.

View Name
Collect statistics about a specific "view". BIND can behave
different, mostly depending on the source IP-address of the
request. These different configurations are called "views". If you
don't use this feature, you most likely are only interested in the
"_default" view.

Within a <View name> block, you can specify which information you
want to collect about a view. If no View block is configured, no
detailed view statistics will be collected.

QTypes true|false
If enabled, the number of outgoing queries by query type (e. g.
"A", "MX") is collected.

Default: Enabled.

ResolverStats true|false
Collect resolver statistics, i. e. statistics about outgoing
requests (e. g. queries over IPv4, lame servers).

Default: Enabled.

CacheRRSets true|false
If enabled, the number of entries ("RR sets") in the view's
cache by query type is collected. Negative entries (queries
which resulted in an error, for example names that do not
exist) are reported with a leading exclamation mark, e. g.
"!A".

Default: Enabled.

Zone Name
When given, collect detailed information about the given zone
in the view. The information collected if very similar to the
global ServerStats information (see above).

You can repeat this option to collect detailed information
about multiple zones.

By default no detailed zone information is collected.

Plugin "buddyinfo"
The buddyinfo plugin collects information by reading "/proc/buddyinfo".
This file contains information about the number of available contagious
physical pages at the moment.

Zone ZoneName
Zone to collect info about. Will collect all zones by default.

Plugin "capabilities"
The "capabilities" plugin collects selected static platform data using
dmidecode and expose it through micro embedded webserver. The data
returned by plugin is in json format.

Synopsis:

<Plugin capabilities>
Host "localhost"
Port "9104"
</Plugin>

Available configuration options for the "capabilities" plugin:

Host Hostname
Bind to the hostname / address Host. By default, the plugin will
bind to the "any" address, i.e. accept packets sent to any of the
hosts addresses.

This option is supported only for libmicrohttpd newer than 0.9.0.

Port Port
Port the embedded webserver should listen on. Defaults to 9104.

Plugin "ceph"
The ceph plugin collects values from JSON data to be parsed by libyajl
(<https://lloyd.github.io/yajl/>) retrieved from ceph daemon admin
sockets.

A separate Daemon block must be configured for each ceph daemon to be
monitored. The following example will read daemon statistics from four
separate ceph daemons running on the same device (two OSDs, one MON,
one MDS) :

<Plugin ceph>
LongRunAvgLatency false
ConvertSpecialMetricTypes true
<Daemon "osd.0">
SocketPath "/var/run/ceph/ceph-osd.0.asok"
</Daemon>
<Daemon "osd.1">
SocketPath "/var/run/ceph/ceph-osd.1.asok"
</Daemon>
<Daemon "mon.a">
SocketPath "/var/run/ceph/ceph-mon.ceph1.asok"
</Daemon>
<Daemon "mds.a">
SocketPath "/var/run/ceph/ceph-mds.ceph1.asok"
</Daemon>
</Plugin>

The ceph plugin accepts the following configuration options:

LongRunAvgLatency true|false
If enabled, latency values(sum,count pairs) are calculated as the
long run average - average since the ceph daemon was started = (sum
/ count). When disabled, latency values are calculated as the
average since the last collection = (sum_now - sum_last) /
(count_now - count_last).

Default: Disabled

ConvertSpecialMetricTypes true|false
If enabled, special metrics (metrics that differ in type from
similar counters) are converted to the type of those similar
counters. This currently only applies to filestore.journal_wr_bytes
which is a counter for OSD daemons. The ceph schema reports this
metric type as a sum,count pair while similar counters are treated
as derive types. When converted, the sum is used as the counter
value and is treated as a derive type. When disabled, all metrics
are treated as the types received from the ceph schema.

Default: Enabled

Each Daemon block must have a string argument for the plugin instance
name. A SocketPath is also required for each Daemon block:

Daemon DaemonName
Name to be used as the instance name for this daemon.

SocketPath SocketPath
Specifies the path to the UNIX admin socket of the ceph daemon.

Plugin "cgroups"
This plugin collects the CPU user/system time for each cgroup by
reading the cpuacct.stat files in the first cpuacct-mountpoint
(typically /sys/fs/cgroup/cpu.cpuacct on machines using systemd).

CGroup Directory
Select cgroup based on the name. Whether only matching cgroups are
collected or if they are ignored is controlled by the
IgnoreSelected option; see below.

See /"IGNORELISTS" for details.

IgnoreSelected true|false
Invert the selection: If set to true, all cgroups except the ones
that match any one of the criteria are collected. By default only
selected cgroups are collected if a selection is made. If no
selection is configured at all, all cgroups are selected.

Plugin "check_uptime"
The check_uptime plugin designed to check and notify about host or
service status based on uptime metric.

When new metric of uptime type appears in cache, OK notification is
sent. When new value for metric is less than previous value, WARNING
notification is sent about host/service restart. When no new updates
comes for metric and cache entry expires, then FAILURE notification is
sent about unreachable host or service.

By default (when no explicit configuration), plugin checks for uptime
metric.

Synopsis:

<Plugin "check_uptime">
Type "uptime"
Type "my_uptime_type"
</Plugin>

Type Type
Metric type to check for status/values. The type should consist
single GAUGE data source.

Plugin "chrony"
The "chrony" plugin collects ntp data from a chronyd server, such as
clock skew and per-peer stratum.

For talking to chronyd, it mimics what the chronyc control program does
on the wire.

Available configuration options for the "chrony" plugin:

Host Hostname
Hostname of the host running chronyd. Defaults to localhost.

Port Port
UDP-Port to connect to. Defaults to 323.

Timeout Timeout
Connection timeout in seconds. Defaults to 2.

Plugin Connectivity
connectivity - Documentation of collectd's "connectivity plugin"

LoadPlugin connectivity
# ...
<Plugin connectivity>
Interface eth0
</Plugin>

The "connectivity plugin" queries interface status using netlink (man 7
netlink) which provides information about network interfaces via the
NETLINK_ROUTE family (man 7 rtnetlink). The plugin translates the value
it receives to collectd's internal format and, depending on the write
plugins you have loaded, it may be written to disk or submitted to
another instance. The plugin listens to interfaces enumerated within
the plugin configuration (see below). If no interfaces are listed,
then the default is for all interfaces to be monitored.

This example shows "connectivity plugin" monitoring all interfaces.
LoadPlugin connectivity <Plugin connectivity> </Plugin>

This example shows "connectivity plugin" monitoring 2 interfaces,
"eth0" and "eth1". LoadPlugin connectivity <Plugin connectivity>
Interface eth0
Interface eth1 </Plugin>

This example shows "connectivity plugin" monitoring all interfaces
except "eth1". LoadPlugin connectivity <Plugin connectivity>
Interface eth1
IgnoreSelected true </Plugin>

Interface interface_name
interface(s) to monitor connect to.

Plugin "conntrack"
This plugin collects IP conntrack statistics.

OldFiles
Assume the conntrack_count and conntrack_max files to be found in
/proc/sys/net/ipv4/netfilter instead of /proc/sys/net/netfilter/.

Plugin "cpu"
The CPU plugin collects CPU usage metrics. By default, CPU usage is
reported as Jiffies, using the "cpu" type. Two aggregations are
available:

• Sum, per-state, over all CPUs installed in the system; and

• Sum, per-CPU, over all non-idle states of a CPU, creating an
"active" state.

The two aggregations can be combined, leading to collectd only emitting
a single "active" metric for the entire system. As soon as one of these
aggregations (or both) is enabled, the cpu plugin will report a
percentage, rather than Jiffies. In addition, you can request
individual, per-state, per-CPU metrics to be reported as percentage.

The following configuration options are available:

ReportByState true|false
When set to true, the default, reports per-state metrics, e.g.
"system", "user" and "idle". When set to false, aggregates (sums)
all non-idle states into one "active" metric.

ReportByCpu true|false
When set to true, the default, reports per-CPU (per-core) metrics.
When set to false, instead of reporting metrics for individual
CPUs, only a global sum of CPU states is emitted.

ValuesPercentage false|true
This option is only considered when both, ReportByCpu and
ReportByState are set to true. In this case, by default, metrics
will be reported as Jiffies. By setting this option to true, you
can request percentage values in the un-aggregated (per-CPU, per-
state) mode as well.

ReportNumCpu false|true
When set to true, reports the number of available CPUs. Defaults
to false.

ReportGuestState false|true
When set to true, reports the "guest" and "guest_nice" CPU states.
Defaults to false.

SubtractGuestState false|true
This option is only considered when ReportGuestState is set to
true. "guest" and "guest_nice" are included in respectively "user"
and "nice". If set to true, "guest" will be subtracted from "user"
and "guest_nice" will be subtracted from "nice". Defaults to true.

Plugin "cpufreq"
This plugin is available on Linux and FreeBSD only. It doesn't have
any options. On Linux it reads
/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq (for the first
CPU installed) to get the current CPU frequency. If this file does not
exist make sure cpufreqd (<http://cpufreqd.sourceforge.net/>) or a
similar tool is installed and an "cpu governor" (that's a kernel
module) is loaded.

On Linux, if the system has the cpufreq-stats kernel module loaded,
this plugin reports the rate of p-state (cpu frequency) transitions and
the percentage of time spent in each p-state.

On FreeBSD it does a sysctl dev.cpu.0.freq and submits this as instance
0. At this time FreeBSD only has one frequency setting for all cores.
See the BUGS section in the FreeBSD man page for cpufreq(4) for more
details.

On FreeBSD the plugin checks the success of sysctl dev.cpu.0.freq and
unregisters the plugin when this fails. A message will be logged to
indicate this.

Plugin "cpusleep"
This plugin doesn't have any options. It reads CLOCK_BOOTTIME and
CLOCK_MONOTONIC and reports the difference between these clocks. Since
BOOTTIME clock increments while device is suspended and MONOTONIC clock
does not, the derivative of the difference between these clocks gives
the relative amount of time the device has spent in suspend state. The
recorded value is in milliseconds of sleep per seconds of wall clock.

Plugin "csv"
DataDir Directory
Set the directory to store CSV-files under. Per default CSV-files
are generated beneath the daemon's working directory, i. e. the
BaseDir. The special strings stdout and stderr can be used to
write to the standard output and standard error channels,
respectively. This, of course, only makes much sense when collectd
is running in foreground- or non-daemon-mode.

StoreRates true|false
If set to true, convert counter values to rates. If set to false
(the default) counter values are stored as is, i. e. as an
increasing integer number.

cURL Statistics
All cURL-based plugins support collection of generic, request-based
statistics. These are disabled by default and can be enabled
selectively for each page or URL queried from the curl, curl_json, or
curl_xml plugins. See the documentation of those plugins for specific
information. This section describes the available metrics that can be
configured for each plugin. All options are disabled by default.

See <http://curl.haxx.se/libcurl/c/curl_easy_getinfo.html> for more
details.

TotalTime true|false
Total time of the transfer, including name resolving, TCP connect,
etc.

NamelookupTime true|false
Time it took from the start until name resolving was completed.

ConnectTime true|false
Time it took from the start until the connect to the remote host
(or proxy) was completed.

AppconnectTime true|false
Time it took from the start until the SSL/SSH connect/handshake to
the remote host was completed.

PretransferTime true|false
Time it took from the start until just before the transfer begins.

StarttransferTime true|false
Time it took from the start until the first byte was received.

RedirectTime true|false
Time it took for all redirection steps include name lookup,
connect, pre-transfer and transfer before final transaction was
started.

RedirectCount true|false
The total number of redirections that were actually followed.

SizeUpload true|false
The total amount of bytes that were uploaded.

SizeDownload true|false
The total amount of bytes that were downloaded.

SpeedDownload true|false
The average download speed that curl measured for the complete
download.

SpeedUpload true|false
The average upload speed that curl measured for the complete
upload.

HeaderSize true|false
The total size of all the headers received.

RequestSize true|false
The total size of the issued requests.

ContentLengthDownload true|false
The content-length of the download.

ContentLengthUpload true|false
The specified size of the upload.

NumConnects true|false
The number of new connections that were created to achieve the
transfer.

Plugin "curl"
The curl plugin uses the libcurl (<http://curl.haxx.se/>) to read web
pages and the match infrastructure (the same code used by the tail
plugin) to use regular expressions with the received data.

The following example will read the current value of AMD stock from
Google's finance page and dispatch the value to collectd.

<Plugin curl>
<Page "stock_quotes">
Plugin "quotes"
URL "http://finance.google.com/finance?q=NYSE%3AAMD"
AddressFamily "any"
User "foo"
Password "bar"
Digest false
VerifyPeer true
VerifyHost true
CACert "/path/to/ca.crt"
Header "X-Custom-Header: foobar"
Post "foo=bar"

MeasureResponseTime false
MeasureResponseCode false

<Match>
Regex "<span +class=\"pr\"[^>]*> *([0-9]*\\.[0-9]+) *</span>"
DSType "GaugeAverage"
# Note: `stock_value' is not a standard type.
Type "stock_value"
Instance "AMD"
</Match>
</Page>
</Plugin>

In the Plugin block, there may be one or more Page blocks, each
defining a web page and one or more "matches" to be performed on the
returned data. The string argument to the Page block is used as plugin
instance.

The following options are valid within Page blocks:

Plugin Plugin
Use Plugin as the plugin name when submitting values. Defaults to
"curl".

URL URL
URL of the web site to retrieve. Since a regular expression will be
used to extract information from this data, non-binary data is a
big plus here ;)

AddressFamily Type
IP version to resolve URL to. Useful in cases when hostname in URL
resolves to both IPv4 and IPv6 addresses, and you are interested in
using one of them specifically. Use "ipv4" to enforce IPv4, "ipv6"
to enforce IPv6, or "any" to keep the default behavior of resolving
addresses to all IP versions your system allows. If "libcurl" is
compiled without IPv6 support, using "ipv6" will result in a
warning and fallback to "any". If "Type" cannot be parsed, a
warning will be printed and the whole Page block will be ignored.

User Name
Username to use if authorization is required to read the page.

Password Password
Password to use if authorization is required to read the page.

Digest true|false
Enable HTTP digest authentication.

VerifyPeer true|false
Enable or disable peer SSL certificate verification. See
<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by
default.

CACert file
File that holds one or more SSL certificates. If you want to use
HTTPS you will possibly need this option. What CA certificates come
bundled with "libcurl" and are checked by default depends on the
distribution you use.

Header Header
A HTTP header to add to the request. Multiple headers are added if
this option is specified more than once.

Post Body
Specifies that the HTTP operation should be a POST instead of a
GET. The complete data to be posted is given as the argument. This
option will usually need to be accompanied by a Header option to
set an appropriate "Content-Type" for the post body (e.g. to
"application/x-www-form-urlencoded").

MeasureResponseTime true|false
Measure response time for the request. If this setting is enabled,
Match blocks (see below) are optional. Disabled by default.

Beware that requests will get aborted if they take too long to
complete. Adjust Timeout accordingly if you expect
MeasureResponseTime to report such slow requests.

This option is similar to enabling the TotalTime statistic but it's
measured by collectd instead of cURL.

MeasureResponseCode true|false
Measure response code for the request. If this setting is enabled,
Match blocks (see below) are optional. Disabled by default.

<Statistics>
One Statistics block can be used to specify cURL statistics to be
collected for each request to the remote web site. See the section
"cURL Statistics" above for details. If this setting is enabled,
Match blocks (see below) are optional.

<Match>
One or more Match blocks that define how to match information in
the data returned by "libcurl". The "curl" plugin uses the same
infrastructure that's used by the "tail" plugin, so please see the
documentation of the "tail" plugin below on how matches are
defined. If the MeasureResponseTime or MeasureResponseCode options
are set to true, Match blocks are optional.

Interval Interval
Sets the interval (in seconds) in which the values will be
collected from this URL. By default the global Interval setting
will be used.

Timeout Milliseconds
The Timeout option sets the overall timeout for HTTP requests to
URL, in milliseconds. By default, the configured Interval is used
to set the timeout. Prior to version 5.5.0, there was no timeout
and requests could hang indefinitely. This legacy behaviour can be
achieved by setting the value of Timeout to 0.

If Timeout is 0 or bigger than the Interval, keep in mind that each
slow network connection will stall one read thread. Adjust the
ReadThreads global setting accordingly to prevent this from
blocking other plugins.

Plugin "curl_json"
The curl_json plugin collects values from JSON data to be parsed by
libyajl (<https://lloyd.github.io/yajl/>) retrieved via either libcurl
(<http://curl.haxx.se/>) or read directly from a unix socket. The
former can be used, for example, to collect values from CouchDB
documents (which are stored JSON notation), and the latter to collect
values from a uWSGI stats socket.

The following example will collect several values from the built-in
"_stats" runtime statistics module of CouchDB
(<http://wiki.apache.org/couchdb/Runtime_Statistics>).

<Plugin curl_json>
<URL "http://localhost:5984/_stats">
AddressFamily "any"
Instance "httpd"
<Key "httpd/requests/count">
Type "http_requests"
</Key>

<Key "httpd_request_methods/*/count">
Type "http_request_methods"
</Key>

<Key "httpd_status_codes/*/count">
Type "http_response_codes"
</Key>
</URL>
</Plugin>

This example will collect data directly from a uWSGI "Stats Server"
socket.

<Plugin curl_json>
<Sock "/var/run/uwsgi.stats.sock">
Instance "uwsgi"
<Key "workers/*/requests">
Type "http_requests"
</Key>

<Key "workers/*/apps/*/requests">
Type "http_requests"
</Key>
</Sock>
</Plugin>

In the Plugin block, there may be one or more URL blocks, each defining
a URL to be fetched via HTTP (using libcurl) or Sock blocks defining a
unix socket to read JSON from directly. Each of these blocks may have
one or more Key blocks.

The Key string argument must be in a path format. Each component is
used to match the key from a JSON map or the index of an JSON array. If
a path component of a Key is a * wildcard, the values for all map keys
or array indices will be collectd.

The following options are valid within URL blocks:

Host Name
Use Name as the host name when submitting values. Defaults to the
global host name setting.

Plugin Plugin
Use Plugin as the plugin name when submitting values. Defaults to
"curl_json".

Instance Instance
Sets the plugin instance to Instance.

Interval Interval
Sets the interval (in seconds) in which the values will be
collected from this URL. By default the global Interval setting
will be used.

User Name
Password Password
Digest true|false
VerifyPeer true|false
VerifyHost true|false
CACert file
Header Header
Post Body
Timeout Milliseconds
These options behave exactly equivalent to the appropriate options
of the cURL plugin. Please see there for a detailed description.

<Statistics>
One Statistics block can be used to specify cURL statistics to be
collected for each request to the remote URL. See the section "cURL
Statistics" above for details.

The following options are valid within Key blocks:

Type Type
Sets the type used to dispatch the values to the daemon. Detailed
information about types and their configuration can be found in
types.db(5). This option is mandatory.

Instance Instance
Type-instance to use. Defaults to the current map key or current
string array element value.

Plugin "curl_jolokia"
The curl_jolokia plugin collects values from MBeanServevr - servlet
engines equipped with the jolokia (<https://jolokia.org>) MBean. It
sends a pre-configured JSON-Postbody to the servlet via HTTP commanding
the jolokia Bean to reply with a singe JSON equipped with all JMX
counters requested. By reducing TCP roundtrips in comparison to
conventional JMX clients that query one value via tcp at a time, it can
return hundrets of values in one roundtrip. Moreof - no java binding
is required in collectd to do so.

It uses libyajl (<https://lloyd.github.io/yajl/>) to parse the Jolokia
JSON reply retrieved via libcurl (<http://curl.haxx.se/>)

<Plugin curl_jolokia>
<URL "http://10.10.10.10:7101/jolokia-war-1.2.0/?ignoreErrors=true&canonicalNaming=false";>
Host "_APPPERF_JMX"
User "webloginname"
Password "passvoid"
Post <JOLOKIA json post data>

<BeanName "PS_Scavenge">
MBean "java.lang:name=PS Scavenge,type=GarbageCollector"
BeanNameSpace "java_lang"
<AttributeName "collectiontime" >
Attribute "CollectionTime"
type "gauge"
</AttributeName>
<AttributeName "collectioncount" >
Attribute "CollectionCount"
type "gauge"
</AttributeName>
</BeanName>
</Plugin>

The plugin is intended to be written in a simple manner. Thus it
doesn't try to solve the task of generating the jolokia post data, or
automatically map the values, but rather leans on a verbose config
containing the prepared flat JSON post data and a config section per
gauge transformed (as one sample shown above). However, Jolokia can
output all available gauges, and we have a python script to filter
them, and generate a configuration for you:

jolokia_2_collectcfg.py

it can gather all interesting gauges, write a simple one value per line
config for itself and subsequent calls. You can remove lines from this
file manually, or create filter lists. You then use the script to
generate a collectd config. The script can then inspect data files
from some testruns, and remove all gauges, that don't contain any
movement.

The base config looks like this:

The following options are valid within URL blocks:

Host Name
Use Name as the host name when submitting values. Defaults to the
global host name setting.

Plugin Plugin
Use Plugin as the plugin name when submitting values. Defaults to
"curl_jolokia".

Instance Instance
Sets the plugin instance to Instance.

Interval Interval
Sets the interval (in seconds) in which the values will be
collected from this URL. By default the global Interval setting
will be used.

<BeanName>
One BeanName block configures the translation of the gauges of one
bean to their respective collectd names, where BeanName sets the
main name.

MBean MBean
The name of the Bean on the server

BeanNameSpace BeanNameSpace
The name space the Bean resides under

AttributeName AttributeName
A bean can contain several Attributes with gauges. Each one can
be matched by a AttributeName section or be ignored.

Attribute Attribute
How should this attribute be called under the BeanName in the
collectd hierarchy?

Type Type
Sets the type used to dispatch the values to the daemon.
Detailed information about types and their configuration can be
found in types.db(5). This option is mandatory.

Plugin "curl_xml"
The curl_xml plugin uses libcurl (<http://curl.haxx.se/>) and libxml2
(<http://xmlsoft.org/>) to retrieve XML data via cURL.

<Plugin "curl_xml">
<URL "http://localhost/stats.xml">
AddressFamily "any"
Host "my_host"
#Plugin "curl_xml"
Instance "some_instance"
User "collectd"
Password "thaiNg0I"
VerifyPeer true
VerifyHost true
CACert "/path/to/ca.crt"
Header "X-Custom-Header: foobar"
Post "foo=bar"

<XPath "table[@id=\"magic_level\"]/tr">
Type "magic_level"
#InstancePrefix "prefix-"
InstanceFrom "td[1]"
#PluginInstanceFrom "td[1]"
ValuesFrom "td[2]/span[@class=\"level\"]"
</XPath>
</URL>
</Plugin>

In the Plugin block, there may be one or more URL blocks, each defining
a URL to be fetched using libcurl. Within each URL block there are
options which specify the connection parameters, for example
authentication information, and one or more XPath blocks.

Each XPath block specifies how to get one type of information. The
string argument must be a valid XPath expression which returns a list
of "base elements". One value is dispatched for each "base element".
The type instance and values are looked up using further XPath
expressions that should be relative to the base element.

Within the URL block the following options are accepted:

Host Name
Use Name as the host name when submitting values. Defaults to the
global host name setting.

Plugin Plugin
Use Plugin as the plugin name when submitting values. Defaults to
'curl_xml'.

Instance Instance
Use Instance as the plugin instance when submitting values. May be
overridden by PluginInstanceFrom option inside XPath blocks.
Defaults to an empty string (no plugin instance).

Interval Interval
Sets the interval (in seconds) in which the values will be
collected from this URL. By default the global Interval setting
will be used.

Namespace Prefix URL
If an XPath expression references namespaces, they must be
specified with this option. Prefix is the "namespace prefix" used
in the XML document. URL is the "namespace name", an URI reference
uniquely identifying the namespace. The option can be repeated to
register multiple namespaces.

Examples:

Namespace "s" "http://schemas.xmlsoap.org/soap/envelope/"
Namespace "m" "http://www.w3.org/1998/Math/MathML"

User User
Password Password
Digest true|false
VerifyPeer true|false
VerifyHost true|false
CACert CA Cert File
Header Header
Post Body
Timeout Milliseconds
These options behave exactly equivalent to the appropriate options
of the cURL plugin. Please see there for a detailed description.

<Statistics>
One Statistics block can be used to specify cURL statistics to be
collected for each request to the remote URL. See the section "cURL
Statistics" above for details.

<XPath XPath-expression>
Within each URL block, there must be one or more XPath blocks. Each
XPath block specifies how to get one type of information. The
string argument must be a valid XPath expression which returns a
list of "base elements". One value is dispatched for each "base
element".

Within the XPath block the following options are accepted:

Type Type
Specifies the Type used for submitting patches. This determines
the number of values that are required / expected and whether
the strings are parsed as signed or unsigned integer or as
double values. See types.db(5) for details. This option is
required.

InstancePrefix InstancePrefix
Prefix the type instance with InstancePrefix. The values are
simply concatenated together without any separator. This
option is optional.

InstanceFrom InstanceFrom
Specifies a XPath expression to use for determining the type
instance. The XPath expression must return exactly one element.
The element's value is then used as type instance, possibly
prefixed with InstancePrefix (see above).

PluginInstanceFrom PluginInstanceFrom
Specifies a XPath expression to use for determining the plugin
instance. The XPath expression must return exactly one element.
The element's value is then used as plugin instance.

If the "base XPath expression" (the argument to the XPath block)
returns exactly one argument, then InstanceFrom and
PluginInstanceFrom may be omitted. Otherwise, at least one of
InstanceFrom or PluginInstanceFrom is required.

ValuesFrom ValuesFrom [ValuesFrom ...]
Specifies one or more XPath expression to use for reading the
values. The number of XPath expressions must match the number
of data sources in the type specified with Type (see above).
Each XPath expression must return exactly one element. The
element's value is then parsed as a number and used as value
for the appropriate value in the value list dispatched to the
daemon. This option is required.

Plugin "dbi"
This plugin uses the dbi library (<http://libdbi.sourceforge.net/>) to
connect to various databases, execute SQL statements and read back the
results. dbi is an acronym for "database interface" in case you were
wondering about the name. You can configure how each column is to be
interpreted and the plugin will generate one or more data sets from
each row returned according to these rules.

Because the plugin is very generic, the configuration is a little more
complex than those of other plugins. It usually looks something like
this:

<Plugin dbi>
<Query "out_of_stock">
Statement "SELECT category, COUNT(*) AS value FROM products WHERE in_stock = 0 GROUP BY category"
# Use with MySQL 5.0.0 or later
MinVersion 50000
<Result>
Type "gauge"
InstancePrefix "out_of_stock"
InstancesFrom "category"
ValuesFrom "value"
</Result>
</Query>
<Database "product_information">
#Plugin "warehouse"
Driver "mysql"
Interval 120
DriverOption "host" "localhost"
DriverOption "username" "collectd"
DriverOption "password" "aZo6daiw"
DriverOption "dbname" "prod_info"
SelectDB "prod_info"
Query "out_of_stock"
</Database>
</Plugin>

The configuration above defines one query with one result and one
database. The query is then linked to the database with the Query
option within the <Database> block. You can have any number of queries
and databases and you can also use the Include statement to split up
the configuration file in multiple, smaller files. However, the <Query>
block must precede the <Database> blocks, because the file is
interpreted from top to bottom!

The following is a complete list of options:

Query blocks

Query blocks define SQL statements and how the returned data should be
interpreted. They are identified by the name that is given in the
opening line of the block. Thus the name needs to be unique. Other than
that, the name is not used in collectd.

In each Query block, there is one or more Result blocks. Result blocks
define which column holds which value or instance information. You can
use multiple Result blocks to create multiple values from one returned
row. This is especially useful, when queries take a long time and
sending almost the same query again and again is not desirable.

Example:

<Query "environment">
Statement "select station, temperature, humidity from environment"
<Result>
Type "temperature"
# InstancePrefix "foo"
InstancesFrom "station"
ValuesFrom "temperature"
</Result>
<Result>
Type "humidity"
InstancesFrom "station"
ValuesFrom "humidity"
</Result>
</Query>

The following options are accepted:

Statement SQL
Sets the statement that should be executed on the server. This is
not interpreted by collectd, but simply passed to the database
server. Therefore, the SQL dialect that's used depends on the
server collectd is connected to.

The query has to return at least two columns, one for the instance
and one value. You cannot omit the instance, even if the statement
is guaranteed to always return exactly one line. In that case, you
can usually specify something like this:

Statement "SELECT \"instance\", COUNT(*) AS value FROM table"

(That works with MySQL but may not be valid SQL according to the
spec. If you use a more strict database server, you may have to
select from a dummy table or something.)

Please note that some databases, for example Oracle, will fail if
you include a semicolon at the end of the statement.

MinVersion Version
MaxVersion Value
Only use this query for the specified database version. You can use
these options to provide multiple queries with the same name but
with a slightly different syntax. The plugin will use only those
queries, where the specified minimum and maximum versions fit the
version of the database in use.

The database version is determined by
"dbi_conn_get_engine_version", see the libdbi documentation
<http://libdbi.sourceforge.net/docs/programmers-guide/reference-
conn.html#DBI-CONN-GET-ENGINE-VERSION> for details. Basically, each
part of the version is assumed to be in the range from 00 to 99 and
all dots are removed. So version "4.1.2" becomes "40102", version
"5.0.42" becomes "50042".

Warning: The plugin will use all matching queries, so if you
specify multiple queries with the same name and overlapping ranges,
weird stuff will happen. Don't to it! A valid example would be
something along these lines:

MinVersion 40000
MaxVersion 49999
...
MinVersion 50000
MaxVersion 50099
...
MinVersion 50100
# No maximum

In the above example, there are three ranges that don't overlap.
The last one goes from version "5.1.0" to infinity, meaning "all
later versions". Versions before "4.0.0" are not specified.

Type Type
The type that's used for each line returned. See types.db(5) for
more details on how types are defined. In short: A type is a
predefined layout of data and the number of values and type of
values has to match the type definition.

If you specify "temperature" here, you need exactly one gauge
column. If you specify "if_octets", you will need two counter
columns. See the ValuesFrom setting below.

There must be exactly one Type option inside each Result block.

InstancePrefix prefix
Prepends prefix to the type instance. If InstancesFrom (see below)
is not given, the string is simply copied. If InstancesFrom is
given, prefix and all strings returned in the appropriate columns
are concatenated together, separated by dashes ("-").

InstancesFrom column0 [column1 ...]
Specifies the columns whose values will be used to create the
"type-instance" for each row. If you specify more than one column,
the value of all columns will be joined together with dashes ("-")
as separation characters.

The plugin itself does not check whether or not all built instances
are different. It's your responsibility to assure that each is
unique. This is especially true, if you do not specify
InstancesFrom: You have to make sure that only one row is returned
in this case.

If neither InstancePrefix nor InstancesFrom is given, the type-
instance will be empty.

ValuesFrom column0 [column1 ...]
Names the columns whose content is used as the actual data for the
data sets that are dispatched to the daemon. How many such columns
you need is determined by the Type setting above. If you specify
too many or not enough columns, the plugin will complain about that
and no data will be submitted to the daemon.

The actual data type in the columns is not that important. The
plugin will automatically cast the values to the right type if it
know how to do that. So it should be able to handle integer an
floating point types, as well as strings (if they include a number
at the beginning).

There must be at least one ValuesFrom option inside each Result
block.

MetadataFrom [column0 column1 ...]
Names the columns whose content is used as metadata for the data
sets that are dispatched to the daemon.

Database blocks

Database blocks define a connection to a database and which queries
should be sent to that database. Since the used "dbi" library can
handle a wide variety of databases, the configuration is very generic.
If in doubt, refer to libdbi's documentation - we stick as close to the
terminology used there.

Each database needs a "name" as string argument in the starting tag of
the block. This name will be used as "PluginInstance" in the values
submitted to the daemon. Other than that, that name is not used.

Plugin Plugin
Use Plugin as the plugin name when submitting query results from
this Database. Defaults to "dbi".

Interval Interval
Sets the interval (in seconds) in which the values will be
collected from this database. By default the global Interval
setting will be used.

Driver Driver
Specifies the driver to use to connect to the database. In many
cases those drivers are named after the database they can connect
to, but this is not a technical necessity. These drivers are
sometimes referred to as "DBD", DataBase Driver, and some
distributions ship them in separate packages. Drivers for the "dbi"
library are developed by the libdbi-drivers project at
<http://libdbi-drivers.sourceforge.net/>.

You need to give the driver name as expected by the "dbi" library
here. You should be able to find that in the documentation for each
driver. If you mistype the driver name, the plugin will dump a list
of all known driver names to the log.

DriverOption Key Value
Sets driver-specific options. What option a driver supports can be
found in the documentation for each driver, somewhere at
<http://libdbi-drivers.sourceforge.net/>. However, the options
"host", "username", "password", and "dbname" seem to be de facto
standards.

DBDs can register two types of options: String options and numeric
options. The plugin will use the "dbi_conn_set_option" function
when the configuration provides a string and the
"dbi_conn_require_option_numeric" function when the configuration
provides a number. So these two lines will actually result in
different calls being used:

DriverOption "Port" 1234 # numeric
DriverOption "Port" "1234" # string

Unfortunately, drivers are not too keen to report errors when an
unknown option is passed to them, so invalid settings here may go
unnoticed. This is not the plugin's fault, it will report errors if
it gets them from the library / the driver. If a driver complains
about an option, the plugin will dump a complete list of all
options understood by that driver to the log. There is no way to
programmatically find out if an option expects a string or a
numeric argument, so you will have to refer to the appropriate
DBD's documentation to find this out. Sorry.

SelectDB Database
In some cases, the database name you connect with is not the
database name you want to use for querying data. If this option is
set, the plugin will "select" (switch to) that database after the
connection is established.

Query QueryName
Associates the query named QueryName with this database connection.
The query needs to be defined before this statement, i. e. all
query blocks you want to refer to must be placed above the database
block you want to refer to them from.

Host Hostname
Sets the host field of value lists to Hostname when dispatching
values. Defaults to the global hostname setting.

Plugin "dcpmm"
The dcpmm plugin will collect Intel(R) Optane(TM) DC Persistent Memory
related performance statistics. The plugin requires root privileges to
perform the statistics collection.

Synopsis:

<Plugin "dcpmm">
Interval 10.0
CollectHealth false
CollectPerfMetrics true
EnableDispatchAll false
</Plugin>

Interval time in seconds
Sets the Interval (in seconds) in which the values will be
collected. Defaults to "global Interval" value. This will override
the global Interval for dcpmm plugin. None of the other plugins
will be affected.

CollectHealth true|false
Collects health information. CollectHealth and CollectPerfMetrics
cannot be true at the same time. Defaults to "false".

The health information metrics are the following:
health_status Overall health summary (0: normal | 1:
non-critical | 2: critical | 3: fatal).
lifespan_remaining The moduleXs remaining life as a
percentage value of factory expected life span.
lifespan_used The moduleXs used life as a percentage
value of factory expected life span.
power_on_time The lifetime the DIMM has been powered
on in seconds.
uptime The current uptime of the DIMM for the
current power cycle in seconds.
last_shutdown_time The time the system was last shutdown.
The time is represented in epoch (seconds).
media_temperature The mediaXs current temperature in
degree Celsius.
controller_temperature The controllerXs current temperature
in degree Celsius.
max_media_temperature The mediaXs the highest temperature
reported in degree Celsius.
max_controller_temperature The controllerXs highest temperature
reported in degree Celsius.
tsc_cycles The number of tsc cycles during each
interval.
epoch The timestamp in seconds at which the
metrics are collected from DCPMM DIMMs.

CollectPerfMetrics true|false
Collects memory performance metrics. CollectHealth and
CollectPerfMetrics cannot be true at the same time. Defaults to
"true".

The memory performance metrics are the following:
total_bytes_read Number of bytes transacted by the read
operations.
total_bytes_written Number of bytes transacted by the write
operations.
read_64B_ops_rcvd Number of read operations performed to the
physical media in 64 bytes granularity.
write_64B_ops_rcvd Number of write operations performed to the
physical media in 64 bytes granularity.
media_read_ops Number of read operations performed to the
physical media.
media_write_ops Number of write operations performed to the
physical media.
host_reads Number of read operations received from the
CPU (memory controller).
host_writes Number of write operations received from the
CPU (memory controller).
read_hit_ratio Measures the efficiency of the buffer in the
read path. Range of 0.0 - 1.0.
write_hit_ratio Measures the efficiency of the buffer in the
write path. Range of 0.0 - 1.0.
tsc_cycles The number of tsc cycles during each
interval.
epoch The timestamp in seconds at which the metrics
are collected from DCPMM DIMMs.

EnableDispatchAll false
This parameter helps to seamlessly enable simultaneous health and
memory perf metrics collection in future. This is unused at the
moment and must always be false.

Plugin "df"
Device Device
Select partitions based on the devicename.

See /"IGNORELISTS" for details.

MountPoint Directory
Select partitions based on the mountpoint.

See /"IGNORELISTS" for details.

FSType FSType
Select partitions based on the filesystem type.

See /"IGNORELISTS" for details.

IgnoreSelected true|false
Invert the selection: If set to true, all partitions except the
ones that match any one of the criteria are collected. By default
only selected partitions are collected if a selection is made. If
no selection is configured at all, all partitions are selected.

LogOnce false|false
Only log stat() errors once.

ReportByDevice true|false
Report using the device name rather than the mountpoint. i.e. with
this false, (the default), it will report a disk as "root", but
with it true, it will be "sda1" (or whichever).

ReportInodes true|false
Enables or disables reporting of free, reserved and used inodes.
Defaults to inode collection being disabled.

Enable this option if inodes are a scarce resource for you, usually
because many small files are stored on the disk. This is a usual
scenario for mail transfer agents and web caches.

ValuesAbsolute true|false
Enables or disables reporting of free and used disk space in
1K-blocks. Defaults to true.

ValuesPercentage false|true
Enables or disables reporting of free and used disk space in
percentage. Defaults to false.

This is useful for deploying collectd on the cloud, where machines
with different disk size may exist. Then it is more practical to
configure thresholds based on relative disk size.

Plugin "disk"
The "disk" plugin collects information about the usage of physical
disks and logical disks (partitions). Values collected are the number
of octets written to and read from a disk or partition, the number of
read/write operations issued to the disk and a rather complex "time" it
took for these commands to be issued.

Using the following two options you can ignore some disks or configure
the collection only of specific disks.

Disk Name
Select the disk Name. Whether it is collected or ignored depends on
the IgnoreSelected setting, see below. As with other plugins that
use the daemon's ignorelist functionality, a string that starts and
ends with a slash is interpreted as a regular expression. Examples:

Disk "sdd"
Disk "/hda[34]/"

See /"IGNORELISTS" for details.

IgnoreSelected true|false
Sets whether selected disks, i. e. the ones matches by any of the
Disk statements, are ignored or if all other disks are ignored. The
behavior (hopefully) is intuitive: If no Disk option is configured,
all disks are collected. If at least one Disk option is given and
no IgnoreSelected or set to false, only matching disks will be
collected. If IgnoreSelected is set to true, all disks are
collected except the ones matched.

UseBSDName true|false
Whether to use the device's "BSD Name", on Mac OS X, instead of the
default major/minor numbers. Requires collectd to be built with
Apple's IOKitLib support.

UdevNameAttr Attribute
Attempt to override disk instance name with the value of a
specified udev attribute when built with libudev. If the attribute
is not defined for the given device, the default name is used.
Example:

UdevNameAttr "DM_NAME"

Please note that using an attribute that does not differentiate
between the whole disk and its particular partitions (like
ID_SERIAL) will result in data about the whole disk and each
partition being mixed together incorrectly. In this case, you can
use ID_COLLECTD attribute that is provided by
contrib/99-storage-collectd.rules udev rule file instead.

Plugin "dns"
Interface Interface
The dns plugin uses libpcap to capture dns traffic and analyzes it.
This option sets the interface that should be used. If this option
is not set, or set to "any", the plugin will try to get packets
from all interfaces. This may not work on certain platforms, such
as Mac OS X.

IgnoreSource IP-address
Ignore packets that originate from this address.

SelectNumericQueryTypes true|false
Enabled by default, collects unknown (and thus presented as numeric
only) query types.

Plugin "dpdkevents"
The dpdkevents plugin collects events from DPDK such as link status of
network ports and Keep Alive status of DPDK logical cores. In order to
get Keep Alive events following requirements must be met: - DPDK >=
16.07 - support for Keep Alive implemented in DPDK application. More
details can be found here:
http://dpdk.org/doc/guides/sample_app_ug/keep_alive.html

Synopsis:

<Plugin "dpdkevents">
<EAL>
Coremask "0x1"
MemoryChannels "4"
FilePrefix "rte"
</EAL>
<Event "link_status">
SendEventsOnUpdate true
EnabledPortMask 0xffff
PortName "interface1"
PortName "interface2"
SendNotification false
</Event>
<Event "keep_alive">
SendEventsOnUpdate true
LCoreMask "0xf"
KeepAliveShmName "/dpdk_keepalive_shm_name"
SendNotification false
</Event>
</Plugin>

Options:

The EAL block

Coremask Mask
Memorychannels Channels
Number of memory channels per processor socket.

FilePrefix File
The prefix text used for hugepage filenames. The filename will be
set to /var/run/.<prefix>_config where prefix is what is passed in
by the user.

The Event block

The Event block defines configuration for specific event. It accepts a
single argument which specifies the name of the event.

Link Status event

SendEventOnUpdate true|false
If set to true link status value will be dispatched only when it is
different from previously read value. This is an optional argument
- default value is true.

EnabledPortMask Mask
A hexidecimal bit mask of the DPDK ports which should be enabled. A
mask of 0x0 means that all ports will be disabled. A bitmask of all
F's means that all ports will be enabled. This is an optional
argument - by default all ports are enabled.

PortName Name
A string containing an optional name for the enabled DPDK ports.
Each PortName option should contain only one port name; specify as
many PortName options as desired. Default naming convention will be
used if PortName is blank. If there are less PortName options than
there are enabled ports, the default naming convention will be used
for the additional ports.

SendNotification true|false
If set to true, link status notifications are sent, instead of link
status being collected as a statistic. This is an optional argument
- default value is false.

Keep Alive event

SendEventOnUpdate true|false
If set to true keep alive value will be dispatched only when it is
different from previously read value. This is an optional argument
- default value is true.

LCoreMask Mask
An hexadecimal bit mask of the logical cores to monitor keep alive
state.

KeepAliveShmName Name
Shared memory name identifier that is used by secondary process to
monitor the keep alive cores state.

SendNotification true|false
If set to true, keep alive notifications are sent, instead of keep
alive information being collected as a statistic. This is an
optional argument - default value is false.

Plugin "dpdkstat"
The dpdkstat plugin collects information about DPDK interfaces using
the extended NIC stats API in DPDK.

Synopsis:

<Plugin "dpdkstat">
<EAL>
Coremask "0x4"
MemoryChannels "4"
FilePrefix "rte"
SocketMemory "1024"
LogLevel "7"
RteDriverLibPath "/usr/lib/dpdk-pmd"
</EAL>
SharedMemObj "dpdk_collectd_stats_0"
EnabledPortMask 0xffff
PortName "interface1"
PortName "interface2"
</Plugin>

Options:

The EAL block

Coremask Mask
A string containing an hexadecimal bit mask of the cores to run on.
Note that core numbering can change between platforms and should be
determined beforehand.

Memorychannels Channels
A string containing a number of memory channels per processor
socket.

FilePrefix File
The prefix text used for hugepage filenames. The filename will be
set to /var/run/.<prefix>_config where prefix is what is passed in
by the user.

SocketMemory MB
A string containing amount of Memory to allocate from hugepages on
specific sockets in MB. This is an optional value.

LogLevel LogLevel_number
A string containing log level number. This parameter is optional.
If parameter is not present then default value "7" - (INFO) is
used. Value "8" - (DEBUG) can be set to enable debug traces.

RteDriverLibPath Path
A string containing path to shared pmd driver lib or path to
directory, where shared pmd driver libs are available. This
parameter is optional. This parameter enable loading of shared pmd
driver libs from defined path. E.g.:
"/usr/lib/dpdk-pmd/librte_pmd_i40e.so" or "/usr/lib/dpdk-pmd"

SharedMemObj Mask
A string containing the name of the shared memory object that should
be used to share stats from the DPDK secondary process to the
collectd dpdkstat plugin. Defaults to dpdk_collectd_stats if no
other value is configured.

EnabledPortMask Mask
A hexidecimal bit mask of the DPDK ports which should be enabled. A
mask of 0x0 means that all ports will be disabled. A bitmask of all
Fs means that all ports will be enabled. This is an optional
argument - default is all ports enabled.

Plugin "dpdk_telemetry"
The dpdk_telemetry plugin collects DPDK ethernet device metrics via
dpdk_telemetry library.

The plugin retrieves metrics from a DPDK packet forwarding application
by sending the JSON formatted message via a UNIX domain socket. The
DPDK telemetry component will respond with a JSON formatted reply,
delivering the requested metrics. The plugin parses the JSON data, and
publishes the metric values to collectd for further use.

Synopsis:

<Plugin dpdk_telemetry>
ClientSocketPath "/var/run/.client"
DpdkSocketPath "/var/run/dpdk/rte/telemetry"
</Plugin>

Options:

ClientSocketPath Client_Path
The UNIX domain client socket at Client_Path to receive messages from
DPDK telemetry library. Defaults to "/var/run/.client".

DpdkSocketPath Dpdk_Path
The UNIX domain DPDK telemetry socket to be connected at Dpdk_Path to
send messages. Defaults to "/var/run/dpdk/rte/telemetry".

Plugin "email"
SocketFile Path
Sets the socket-file which is to be created.

SocketGroup Group
If running as root change the group of the UNIX-socket after it has
been created. Defaults to collectd.

SocketPerms Permissions
Change the file permissions of the UNIX-socket after it has been
created. The permissions must be given as a numeric, octal value as
you would pass to chmod(1). Defaults to 0770.

MaxConns Number
Sets the maximum number of connections that can be handled in
parallel. Since this many threads will be started immediately
setting this to a very high value will waste valuable resources.
Defaults to 5 and will be forced to be at most 16384 to prevent
typos and dumb mistakes.

Plugin "ethstat"
The ethstat plugin collects information about network interface cards
(NICs) by talking directly with the underlying kernel driver using
ioctl(2).

Synopsis:

<Plugin "ethstat">
Interface "eth0"
Map "rx_csum_offload_errors" "if_rx_errors" "checksum_offload"
Map "multicast" "if_multicast"
</Plugin>

Options:

Interface Name
Collect statistical information about interface Name.

Map Name Type [TypeInstance]
By default, the plugin will submit values as type "derive" and type
instance set to Name, the name of the metric as reported by the
driver. If an appropriate Map option exists, the given Type and,
optionally, TypeInstance will be used.

MappedOnly true|false
When set to true, only metrics that can be mapped to a type will be
collected, all other metrics will be ignored. Defaults to false.

Plugin "exec"
Please make sure to read collectd-exec(5) before using this plugin. It
contains valuable information on when the executable is executed and
the output that is expected from it.

Exec User[:[Group]] Executable [<arg> [<arg> ...]]
NotificationExec User[:[Group]] Executable [<arg> [<arg> ...]]
Execute the executable Executable as user User. If the user name is
followed by a colon and a group name, the effective group is set to
that group. The real group and saved-set group will be set to the
default group of that user. If no group is given the effective
group ID will be the same as the real group ID.

Please note that in order to change the user and/or group the
daemon needs superuser privileges. If the daemon is run as an
unprivileged user you must specify the same user/group here. If the
daemon is run with superuser privileges, you must supply a non-root
user here.

The executable may be followed by optional arguments that are
passed to the program. Please note that due to the configuration
parsing numbers and boolean values may be changed. If you want to
be absolutely sure that something is passed as-is please enclose it
in quotes.

The Exec and NotificationExec statements change the semantics of
the programs executed, i. e. the data passed to them and the
response expected from them. This is documented in great detail in
collectd-exec(5).

Plugin "fhcount"
The "fhcount" plugin provides statistics about used, unused and total
number of file handles on Linux.

The fhcount plugin provides the following configuration options:

ValuesAbsolute true|false
Enables or disables reporting of file handles usage in absolute
numbers, e.g. file handles used. Defaults to true.

ValuesPercentage false|true
Enables or disables reporting of file handles usage in percentages,
e.g. percent of file handles used. Defaults to false.

Plugin "filecount"
The "filecount" plugin counts the number of files in a certain
directory (and its subdirectories) and their combined size. The
configuration is very straight forward:

<Plugin "filecount">
<Directory "/var/qmail/queue/mess">
Instance "qmail-message"
</Directory>
<Directory "/var/qmail/queue/todo">
Instance "qmail-todo"
</Directory>
<Directory "/var/db/php5">
Instance "php5-sessions"
Name "sess_*"
</Directory>
</Plugin>

The example above counts the number of files in QMail's queue
directories and the number of PHP5 sessions. Jfiy: The "todo" queue
holds the messages that QMail has not yet looked at, the "message"
queue holds the messages that were classified into "local" and
"remote".

As you can see, the configuration consists of one or more "Directory"
blocks, each of which specifies a directory in which to count the
files. Within those blocks, the following options are recognized:

Plugin Plugin
Use Plugin as the plugin name when submitting values. Defaults to
filecount.

Instance Instance
Sets the plugin instance to Instance. If not given, the instance is
set to the directory name with all slashes replaced by underscores
and all leading underscores removed. Empty value is allowed.

Name Pattern
Only count files that match Pattern, where Pattern is a shell-like
wildcard as understood by fnmatch(3). Only the filename is checked
against the pattern, not the entire path. In case this makes it
easier for you: This option has been named after the -name
parameter to find(1).

MTime Age
Count only files of a specific age: If Age is greater than zero,
only files that haven't been touched in the last Age seconds are
counted. If Age is a negative number, this is inversed. For
example, if -60 is specified, only files that have been modified in
the last minute will be counted.

The number can also be followed by a "multiplier" to easily specify
a larger timespan. When given in this notation, the argument must
in quoted, i. e. must be passed as string. So the -60 could also
be written as "-1m" (one minute). Valid multipliers are "s"
(second), "m" (minute), "h" (hour), "d" (day), "w" (week), and "y"
(year). There is no "month" multiplier. You can also specify
fractional numbers, e. g. "0.5d" is identical to "12h".

Size Size
Count only files of a specific size. When Size is a positive
number, only files that are at least this big are counted. If Size
is a negative number, this is inversed, i. e. only files smaller
than the absolute value of Size are counted.

As with the MTime option, a "multiplier" may be added. For a
detailed description see above. Valid multipliers here are "b"
(byte), "k" (kilobyte), "m" (megabyte), "g" (gigabyte), "t"
(terabyte), and "p" (petabyte). Please note that there are 1000
bytes in a kilobyte, not 1024.

Recursive true|false
Controls whether or not to recurse into subdirectories. Enabled by
default.

IncludeHidden true|false
Controls whether or not to include "hidden" files and directories
in the count. "Hidden" files and directories are those, whose name
begins with a dot. Defaults to false, i.e. by default hidden files
and directories are ignored.

RegularOnly true|false
Controls whether or not to include only regular files in the count.
Defaults to true, i.e. by default non regular files are ignored.

FilesSizeType Type
Sets the type used to dispatch files combined size. Empty value
("") disables reporting. Defaults to bytes.

FilesCountType Type
Sets the type used to dispatch number of files. Empty value ("")
disables reporting. Defaults to files.

TypeInstance Instance
Sets the type instance used to dispatch values. Defaults to an
empty string (no plugin instance).

Plugin "GenericJMX"
The GenericJMX plugin is written in Java and therefore documented in
collectd-java(5).

Plugin "gmond"
The gmond plugin received the multicast traffic sent by gmond, the
statistics collection daemon of Ganglia. Mappings for the standard
"metrics" are built-in, custom mappings may be added via Metric blocks,
see below.

Synopsis:

<Plugin "gmond">
MCReceiveFrom "239.2.11.71" "8649"
<Metric "swap_total">
Type "swap"
TypeInstance "total"
DataSource "value"
</Metric>
<Metric "swap_free">
Type "swap"
TypeInstance "free"
DataSource "value"
</Metric>
</Plugin>

The following metrics are built-in:

• load_one, load_five, load_fifteen

• cpu_user, cpu_system, cpu_idle, cpu_nice, cpu_wio

• mem_free, mem_shared, mem_buffers, mem_cached, mem_total

• bytes_in, bytes_out

• pkts_in, pkts_out

Available configuration options:

MCReceiveFrom MCGroup [Port]
Sets sets the multicast group and UDP port to which to subscribe.

Default: 239.2.11.71 / 8649

<Metric Name>
These blocks add a new metric conversion to the internal table.
Name, the string argument to the Metric block, is the metric name
as used by Ganglia.

Type Type
Type to map this metric to. Required.

TypeInstance Instance
Type-instance to use. Optional.

DataSource Name
Data source to map this metric to. If the configured type has
exactly one data source, this is optional. Otherwise the option
is required.

Plugin "gps"
The "gps plugin" connects to gpsd on the host machine. The host, port,
timeout and pause are configurable.

This is useful if you run an NTP server using a GPS for source and you
want to monitor it.

Mind your GPS must send $--GSA for having the data reported!

The following elements are collected:

satellites
Number of satellites used for fix (type instance "used") and in
view (type instance "visible"). 0 means no GPS satellites are
visible.

dilution_of_precision
Vertical and horizontal dilution (type instance "horizontal" or
"vertical"). It should be between 0 and 3. Look at the
documentation of your GPS to know more.

Synopsis:

LoadPlugin gps
<Plugin "gps">
# Connect to localhost on gpsd regular port:
Host "127.0.0.1"
Port "2947"
# 15 ms timeout
Timeout 0.015
# PauseConnect of 5 sec. between connection attempts.
PauseConnect 5
</Plugin>

Available configuration options:

Host Host
The host on which gpsd daemon runs. Defaults to localhost.

Port Port
Port to connect to gpsd on the host machine. Defaults to 2947.

Timeout Seconds
Timeout in seconds (default 0.015 sec).

The GPS data stream is fetch by the plugin form the daemon. It
waits for data to be available, if none arrives it times out and
loop for another reading. Mind to put a low value gpsd expects
value in the micro-seconds area (recommended is 500 us) since the
waiting function is blocking. Value must be between 500 us and 5
sec., if outside that range the default value is applied.

This only applies from gpsd release-2.95.

PauseConnect Seconds
Pause to apply between attempts of connection to gpsd in seconds
(default 5 sec).

Plugin "gpu_nvidia"
Efficiently collects various statistics from the system's NVIDIA GPUs
using the NVML library. Currently collected are fan speed, core
temperature, percent load, percent memory used, compute and memory
frequencies, and power consumption.

GPUIndex
If one or more of these options is specified, only GPUs at that
index (as determined by nvidia-utils through nvidia-smi) have
statistics collected. If no instance of this option is specified,
all GPUs are monitored.

IgnoreSelected
If set to true, all detected GPUs except the ones at indices
specified by GPUIndex entries are collected. For greater clarity,
setting IgnoreSelected without any GPUIndex directives will result
in no statistics being collected.

InstanceByGPUIndex
If set to false, the GPU ID will not be part of the plugin
instance. The default is 'GPU ID'-'GPU name'

InstanceByGPUName
If set to false, the GPU name will not be part of the plugin
instance. The default is 'GPU ID'-'GPU name'

Plugin "grpc"
The grpc plugin provides an RPC interface to submit values to or query
values from collectd based on the open source gRPC framework. It
exposes an end-point for dispatching values to the daemon.

The gRPC homepage can be found at <https://grpc.io/>.

Server Host Port
The Server statement sets the address of a server to which to send
metrics via the "DispatchValues" function.

The argument Host may be a hostname, an IPv4 address, or an IPv6
address.

Optionally, Server may be specified as a configuration block which
supports the following options:

EnableSSL false|true
Whether to require SSL for outgoing connections. Default:
false.

SSLCACertificateFile Filename
SSLCertificateFile Filename
SSLCertificateKeyFile Filename
Filenames specifying SSL certificate and key material to be
used with SSL connections.

Listen Host Port
The Listen statement sets the network address to bind to. When
multiple statements are specified, the daemon will bind to all of
them. If none are specified, it defaults to 0.0.0.0:50051.

The argument Host may be a hostname, an IPv4 address, or an IPv6
address.

Optionally, Listen may be specified as a configuration block which
supports the following options:

EnableSSL true|false
Whether to enable SSL for incoming connections. Default: false.

SSLCACertificateFile Filename
SSLCertificateFile Filename
SSLCertificateKeyFile Filename
Filenames specifying SSL certificate and key material to be
used with SSL connections.

VerifyPeer true|false
When enabled, a valid client certificate is required to connect
to the server. When disabled, a client certifiacte is not
requested and any unsolicited client certificate is accepted.
Enabled by default.

Plugin "hddtemp"
To get values from hddtemp collectd connects to localhost (127.0.0.1),
port 7634/tcp. The Host and Port options can be used to change these
default values, see below. "hddtemp" has to be running to work
correctly. If "hddtemp" is not running timeouts may appear which may
interfere with other statistics..

The hddtemp homepage can be found at
<http://www.guzu.net/linux/hddtemp.php>.

Host Hostname
Hostname to connect to. Defaults to 127.0.0.1.

Port Port
TCP-Port to connect to. Defaults to 7634.

Plugin "hugepages"
To collect hugepages information, collectd reads directories
"/sys/devices/system/node/*/hugepages" and "/sys/kernel/mm/hugepages".
Reading of these directories can be disabled by the following options
(default is enabled).

ReportPerNodeHP true|false
If enabled, information will be collected from the hugepage
counters in "/sys/devices/system/node/*/hugepages". This is used
to check the per-node hugepage statistics on a NUMA system.

ReportRootHP true|false
If enabled, information will be collected from the hugepage
counters in "/sys/kernel/mm/hugepages". This can be used on both
NUMA and non-NUMA systems to check the overall hugepage statistics.

ValuesPages true|false
Whether to report hugepages metrics in number of pages. Defaults
to true.

ValuesBytes false|true
Whether to report hugepages metrics in bytes. Defaults to false.

ValuesPercentage false|true
Whether to report hugepages metrics as percentage. Defaults to
false.

Plugin "infiniband"
The "infiniband" plugin collects information about IB ports. Metrics
are gathered from "/sys/class/infiniband/DEVICE/port/PORTNUM/*", and
Port names are formatted like "DEVICE:PORTNUM" (see examples below).

Options:

Port Port
Select the port Port. Whether it is collected or ignored depends on
the IgnoreSelected setting, see below. As with other plugins that
use the daemon's ignorelist functionality, a string that starts and
ends with a slash is interpreted as a regular expression. Examples:

Port "mlx5_0:1"
Port "/mthca0:[0-9]/"

See /"IGNORELISTS" for details.

IgnoreSelected true|false
Sets whether selected ports are ignored or if all other ports are
ignored. The behavior (hopefully) is intuitive: If no Port option
is configured, all ports are collected. If at least one Port option
is given and IgnoreSelected is not given or set to false, only
matching ports will be collected. If IgnoreSelected is set to true,
all ports are collected except the ones matched.

Plugin "intel_pmu"
The intel_pmu plugin collects performance counters data on Intel CPUs
using Linux perf interface. All events are reported on a per core
basis.

Synopsis:

<Plugin intel_pmu>
ReportHardwareCacheEvents true
ReportKernelPMUEvents true
ReportSoftwareEvents true
EventList "/var/cache/pmu/GenuineIntel-6-2D-core.json"
HardwareEvents "L2_RQSTS.CODE_RD_HIT,L2_RQSTS.CODE_RD_MISS" "L2_RQSTS.ALL_CODE_RD"
Cores "0-3" "4,6" "[12-15]"
DispatchMultiPmu false
</Plugin>

Options:

ReportHardwareCacheEvents false|true
Enable or disable measuring of hardware CPU cache events:
- L1-dcache-loads
- L1-dcache-load-misses
- L1-dcache-stores
- L1-dcache-store-misses
- L1-dcache-prefetches
- L1-dcache-prefetch-misses
- L1-icache-loads
- L1-icache-load-misses
- L1-icache-prefetches
- L1-icache-prefetch-misses
- LLC-loads
- LLC-load-misses
- LLC-stores
- LLC-store-misses
- LLC-prefetches
- LLC-prefetch-misses
- dTLB-loads
- dTLB-load-misses
- dTLB-stores
- dTLB-store-misses
- dTLB-prefetches
- dTLB-prefetch-misses
- iTLB-loads
- iTLB-load-misses
- branch-loads
- branch-load-misses

ReportKernelPMUEvents false|true
Enable or disable measuring of the following events:
- cpu-cycles
- instructions
- cache-references
- cache-misses
- branches
- branch-misses
- bus-cycles

ReportSoftwareEvents false|true
Enable or disable measuring of software events provided by kernel:
- cpu-clock
- task-clock
- context-switches
- cpu-migrations
- page-faults
- minor-faults
- major-faults
- alignment-faults
- emulation-faults

EventList filename
JSON performance counter event list file name. To be able to
monitor all Intel CPU specific events JSON event list file should
be downloaded. Use the pmu-tools event_download.py script to
download event list for current CPU.

HardwareEvents events
This field is a list of event names or groups of comma separated
event names. This option requires EventList option to be
configured.

Cores cores groups
All events are reported on a per core basis. Monitoring of the
events can be configured for a group of cores (aggregated
statistics). This field defines groups of cores on which to monitor
supported events. The field is represented as list of strings with
core group values. Each string represents a list of cores in a
group. If a group is enclosed in square brackets each core is added
individually to a separate group (that is statistics are not
aggregated). Allowed formats are:
0,1,2,3
0-10,20-18
1,3,5-8,10,0x10-12
[4-15,32-63]

If an empty string is provided as value for this field default
cores configuration is applied - that is separate group is created
for each core.

DispatchMultiPmu false|true
Enable or disable dispatching of cloned multi PMU for uncore
events. If disabled only total sum is dispatched as single event.
If enabled separate metric is dispatched for every counter.

Plugin "intel_rdt"
The intel_rdt plugin collects information provided by monitoring
features of Intel Resource Director Technology (Intel(R) RDT) like
Cache Monitoring Technology (CMT), Memory Bandwidth Monitoring (MBM).
These features provide information about utilization of shared
resources. CMT monitors last level cache occupancy (LLC). MBM supports
two types of events reporting local and remote memory bandwidth. Local
memory bandwidth (MBL) reports the bandwidth of accessing memory
associated with the local socket. Remote memory bandwidth (MBR) reports
the bandwidth of accessing the remote socket. Also this technology
allows to monitor instructions per clock (IPC). Monitor events are
hardware dependant. Monitoring capabilities are detected on plugin
initialization and only supported events are monitored.

Note: intel_rdt plugin is using model-specific registers (MSRs), which
require an additional capability to be enabled if collectd is run as a
service. Please refer to contrib/systemd.collectd.service file for
more details.

Synopsis:

<Plugin "intel_rdt">
Cores "0-2" "3,4,6" "8-10,15"
Processes "sshd,qemu-system-x86" "bash"
</Plugin>

Options:

Interval seconds
The interval within which to retrieve statistics on monitored
events in seconds. For milliseconds divide the time by 1000 for
example if the desired interval is 50ms, set interval to 0.05. Due
to limited capacity of counters it is not recommended to set
interval higher than 1 sec.

Cores cores groups
Monitoring of the events can be configured for group of cores
(aggregated statistics). This field defines groups of cores on
which to monitor supported events. The field is represented as list
of strings with core group values. Each string represents a list of
cores in a group. Allowed formats are:
0,1,2,3
0-10,20-18
1,3,5-8,10,0x10-12

If an empty string is provided as value for this field default
cores configuration is applied - a separate group is created for
each core.

Processes process names groups
Monitoring of the events can be configured for group of processes
(aggregated statistics). This field defines groups of processes on
which to monitor supported events. The field is represented as list
of strings with process names group values. Each string represents
a list of processes in a group. Allowed format is:
sshd,bash,qemu

Note: By default global interval is used to retrieve statistics on
monitored events. To configure a plugin specific interval use Interval
option of the intel_rdt <LoadPlugin> block. For milliseconds divide the
time by 1000 for example if the desired interval is 50ms, set interval
to 0.05. Due to limited capacity of counters it is not recommended to
set interval higher than 1 sec.

Plugin "interface"
Interface Interface
Select this interface. By default these interfaces will then be
collected. For a more detailed description see IgnoreSelected
below.

See /"IGNORELISTS" for details.

IgnoreSelected true|false
If no configuration is given, the interface-plugin will collect
data from all interfaces. This may not be practical, especially for
loopback- and similar interfaces. Thus, you can use the
Interface-option to pick the interfaces you're interested in.
Sometimes, however, it's easier/preferred to collect all interfaces
except a few ones. This option enables you to do that: By setting
IgnoreSelected to true the effect of Interface is inverted: All
selected interfaces are ignored and all other interfaces are
collected.

It is possible to use regular expressions to match interface names,
if the name is surrounded by /.../ and collectd was compiled with
support for regexps. This is useful if there's a need to collect
(or ignore) data for a group of interfaces that are similarly
named, without the need to explicitly list all of them (especially
useful if the list is dynamic). Example:

Interface "lo"
Interface "/^veth/"
Interface "/^tun[0-9]+/"
IgnoreSelected "true"

This will ignore the loopback interface, all interfaces with names
starting with veth and all interfaces with names starting with tun
followed by at least one digit.

ReportInactive true|false
When set to false, only interfaces with non-zero traffic will be
reported. Note that the check is done by looking into whether a
package was sent at any time from boot and the corresponding
counter is non-zero. So, if the interface has been sending data in
the past since boot, but not during the reported time-interval, it
will still be reported.

The default value is true and results in collection of the data
from all interfaces that are selected by Interface and
IgnoreSelected options.

UniqueName true|false
Interface name is not unique on Solaris (KSTAT), interface name is
unique only within a module/instance. Following tuple is considered
unique:
(ks_module, ks_instance, ks_name) If this option is set to true,
interface name contains above three fields separated by an
underscore. For more info on KSTAT, visit
<http://docs.oracle.com/cd/E23824_01/html/821-1468/kstat-3kstat.html#REFMAN3Ekstat-3kstat>

This option is only available on Solaris.

Plugin "ipmi"
The ipmi plugin allows to monitor server platform status using the
Intelligent Platform Management Interface (IPMI). Local and remote
interfaces are supported.

The plugin configuration consists of one or more Instance blocks which
specify one ipmi connection each. Each block requires one unique string
argument as the instance name. If instances are not configured, an
instance with the default option values will be created.

For backwards compatibility, any option other than Instance block will
trigger legacy config handling and it will be treated as an option
within Instance block. This support will go away in the next major
version of Collectd.

Within the Instance blocks, the following options are allowed:

Address Address
Hostname or IP to connect to. If not specified, plugin will try to
connect to local management controller (BMC).

Username Username
Password Password
The username and the password to use for the connection to remote
BMC.

AuthType MD5|rmcp+
Forces the authentication type to use for the connection to remote
BMC. By default most secure type is seleted.

Host Hostname
Sets the host field of dispatched values. Defaults to the global
hostname setting.

Sensor Sensor
Selects sensors to collect or to ignore, depending on
IgnoreSelected.

See /"IGNORELISTS" for details.

IgnoreSelected true|false
If no configuration if given, the ipmi plugin will collect data
from all sensors found of type "temperature", "voltage", "current"
and "fanspeed". This option enables you to do that: By setting
IgnoreSelected to true the effect of Sensor is inverted: All
selected sensors are ignored and all other sensors are collected.

NotifySensorAdd true|false
If a sensor appears after initialization time of a minute a
notification is sent.

NotifySensorRemove true|false
If a sensor disappears a notification is sent.

NotifySensorNotPresent true|false
If you have for example dual power supply and one of them is
(un)plugged then a notification is sent.

NotifyIPMIConnectionState true|false
If a IPMI connection state changes after initialization time of a
minute a notification is sent. Defaults to false.

SELEnabled true|false
If system event log (SEL) is enabled, plugin will listen for sensor
threshold and discrete events. When event is received the
notification is sent. SEL event filtering can be configured using
SELSensor and SELIgnoreSelected config options. Defaults to false.

SELSensor SELSensor
Selects sensors to get events from or to ignore, depending on
SELIgnoreSelected.

See /"IGNORELISTS" for details.

SELIgnoreSelected true|false
If no configuration is given, the ipmi plugin will pass events from
all sensors. This option enables you to do that: By setting
SELIgnoreSelected to true the effect of SELSensor is inverted: All
events from selected sensors are ignored and all events from other
sensors are passed.

SELClearEvent true|false
If SEL clear event is enabled, plugin will delete event from SEL
list after it is received and successfully handled. In this case
other tools that are subscribed for SEL events will receive an
empty event. Defaults to false.

Plugin "ipstats"
This plugin collects counts for ipv4 and ipv6 various types of packets
passing through the system in total. At the moment it's only supported
on FreeBSD.

The full list of options available to include in the counted statistics
is:
ip4receive IPv4 total packets received
ip4badsum IPv4 checksum bad
ip4tooshort IPv4 packet too short
ip4toosmall IPv4 not enough data
ip4badhlen IPv4 ip header length < data size
ip4badlen IPv4 ip length < ip header length
ip4fragment IPv4 fragments received
ip4fragdrop IPv4 frags dropped (dups, out of space)
ip4fragtimeout IPv4 fragments timed out
ip4forward IPv4 packets forwarded
ip4fastforward IPv4 packets fast forwarded
ip4cantforward IPv4 packets rcvd for unreachable dest
ip4redirectsent IPv4 packets forwarded on same net
ip4noproto IPv4 unknown or unsupported protocol
ip4deliver IPv4 datagrams delivered to upper level
ip4transmit IPv4 total ip packets generated here
ip4odrop IPv4 lost packets due to nobufs, etc.
ip4reassemble IPv4 total packets reassembled ok
ip4fragmented IPv4 datagrams successfully fragmented
ip4ofragment IPv4 output fragments created
ip4cantfrag IPv4 don't fragment flag was set, etc.
ip4badoptions IPv4 error in option processing
ip4noroute IPv4 packets discarded due to no route
ip4badvers IPv4 ip version != 4
ip4rawout IPv4 total raw ip packets generated
ip4toolong IPv4 ip length > max ip packet size
ip4notmember IPv4 multicasts for unregistered grps
ip4nogif IPv4 no match gif found
ip4badaddr IPv4 invalid address on header

ip6receive IPv6 total packets received
ip6tooshort IPv6 packet too short
ip6toosmall IPv6 not enough data
ip6fragment IPv6 fragments received
ip6fragdrop IPv6 frags dropped(dups, out of space)
ip6fragtimeout IPv6 fragments timed out
ip6fragoverflow IPv6 fragments that exceeded limit
ip6forward IPv6 packets forwarded
ip6cantforward IPv6 packets rcvd for unreachable dest
ip6redirectsent IPv6 packets forwarded on same net
ip6deliver IPv6 datagrams delivered to upper level
ip6transmit IPv6 total ip packets generated here
ip6odrop IPv6 lost packets due to nobufs, etc.
ip6reassemble IPv6 total packets reassembled ok
ip6fragmented IPv6 datagrams successfully fragmented
ip6ofragment IPv6 output fragments created
ip6cantfrag IPv6 don't fragment flag was set, etc.
ip6badoptions IPv6 error in option processing
ip6noroute IPv6 packets discarded due to no route
ip6badvers IPv6 ip6 version != 6
ip6rawout IPv6 total raw ip packets generated
ip6badscope IPv6 scope error
ip6notmember IPv6 don't join this multicast group
ip6nogif IPv6 no match gif found
ip6toomanyhdr IPv6 discarded due to too many headers

By default the following options are included in the counted packets:

- ip4receive - ip4forward - ip4transmit

- ip6receive - ip6forward - ip6transmit

For example to also count IPv4 and IPv6 fragments received, include the
following configuration:

<Plugin ipstats>
ip4fragment true
ip6fragment true
</Plugin>

Plugin "iptables"
Chain Table Chain [Comment|Number [Name]]
Chain6 Table Chain [Comment|Number [Name]]
Select the iptables/ip6tables filter rules to count packets and
bytes from.

If only Table and Chain are given, this plugin will collect the
counters of all rules which have a comment-match. The comment is
then used as type-instance.

If Comment or Number is given, only the rule with the matching
comment or the nth rule will be collected. Again, the comment (or
the number) will be used as the type-instance.

If Name is supplied, it will be used as the type-instance instead
of the comment or the number.

Plugin "irq"
Irq Irq
Select this irq. By default these irqs will then be collected. For
a more detailed description see IgnoreSelected below.

See /"IGNORELISTS" for details.

IgnoreSelected true|false
If no configuration if given, the irq-plugin will collect data from
all irqs. This may not be practical, especially if no interrupts
happen. Thus, you can use the Irq-option to pick the interrupt
you're interested in. Sometimes, however, it's easier/preferred to
collect all interrupts except a few ones. This option enables you
to do that: By setting IgnoreSelected to true the effect of Irq is
inverted: All selected interrupts are ignored and all other
interrupts are collected.

Plugin "java"
The Java plugin makes it possible to write extensions for collectd in
Java. This section only discusses the syntax and semantic of the
configuration options. For more in-depth information on the Java
plugin, please read collectd-java(5).

Synopsis:

<Plugin "java">
JVMArg "-verbose:jni"
JVMArg "-Djava.class.path=/opt/collectd/lib/collectd/bindings/java"
LoadPlugin "org.collectd.java.Foobar"
<Plugin "org.collectd.java.Foobar">
# To be parsed by the plugin
</Plugin>
</Plugin>

Available configuration options:

JVMArg Argument
Argument that is to be passed to the Java Virtual Machine (JVM).
This works exactly the way the arguments to the java binary on the
command line work. Execute "java --help" for details.

Please note that all these options must appear before (i. e. above)
any other options! When another option is found, the JVM will be
started and later options will have to be ignored!

LoadPlugin JavaClass
Instantiates a new JavaClass object. The constructor of this object
very likely then registers one or more callback methods with the
server.

See collectd-java(5) for details.

When the first such option is found, the virtual machine (JVM) is
created. This means that all JVMArg options must appear before
(i. e. above) all LoadPlugin options!

Plugin Name
The entire block is passed to the Java plugin as an
org.collectd.api.OConfigItem object.

For this to work, the plugin has to register a configuration
callback first, see "config callback" in collectd-java(5). This
means, that the Plugin block must appear after the appropriate
LoadPlugin block. Also note, that Name depends on the (Java) plugin
registering the callback and is completely independent from the
JavaClass argument passed to LoadPlugin.

Plugin "load"
The Load plugin collects the system load. These numbers give a rough
overview over the utilization of a machine. The system load is defined
as the number of runnable tasks in the run-queue and is provided by
many operating systems as a one, five or fifteen minute average.

The following configuration options are available:

ReportRelative false|true
When enabled, system load divided by number of available CPU cores
is reported for intervals 1 min, 5 min and 15 min. Defaults to
false.

Plugin "logfile"
LogLevel debug|info|notice|warning|err
Sets the log-level. If, for example, set to notice, then all events
with severity notice, warning, or err will be written to the
logfile.

Please note that debug is only available if collectd has been
compiled with debugging support.

File File
Sets the file to write log messages to. The special strings stdout
and stderr can be used to write to the standard output and standard
error channels, respectively. This, of course, only makes much
sense when collectd is running in foreground- or non-daemon-mode.

Timestamp true|false
Prefix all lines printed by the current time. Defaults to true.

PrintSeverity true|false
When enabled, all lines are prefixed by the severity of the log
message, for example "warning". Defaults to false.

Note: There is no need to notify the daemon after moving or removing
the log file (e. g. when rotating the logs). The plugin reopens the
file for each line it writes.

Plugin "logparser"
The logparser plugin is used to parse different kinds of logs. Setting
proper options you can choose strings to collect. Plugin searches the
log file for messages which contain several matches (two or more). When
all mandatory matches are found then it sends proper notification
containing all fetched values.

Synopsis:

<Plugin logparser>
<Logfile "/var/log/syslog">
FirstFullRead false
<Message "pcie_errors">
DefaultType "pcie_error"
DefaultSeverity "warning"
<Match "aer error">
Regex "AER:.*error received"
SubmatchIdx -1
</Match>
<Match "incident time">
Regex "(... .. ..:..:..) .* pcieport.*AER"
SubmatchIdx 1
IsMandatory false
</Match>
<Match "root port">
Regex "pcieport (.*): AER:"
SubmatchIdx 1
IsMandatory true
</Match>
<Match "device">
PluginInstance true
Regex " ([0-9a-fA-F:\\.]*): PCIe Bus Error"
SubmatchIdx 1
IsMandatory false
</Match>
<Match "severity_mandatory">
Regex "severity="
SubMatchIdx -1
</Match>
<Match "nonfatal">
Regex "severity=.*\\([nN]on-[fF]atal"
TypeInstance "non_fatal"
IsMandatory false
</Match>
<Match "fatal">
Regex "severity=.*\\([fF]atal"
Severity "failure"
TypeInstance "fatal"
IsMandatory false
</Match>
<Match "corrected">
Regex "severity=Corrected"
TypeInstance "correctable"
IsMandatory false
</Match>
<Match "error type">
Regex "type=(.*),"
SubmatchIdx 1
IsMandatory false
</Match>
<Match "id">
Regex ", id=(.*)"
SubmatchIdx 1
</Match>
</Message>
</Logfile>
</Plugin>

Options:

Logfile File
The Logfile block defines file to search. It may contain one or
more Message blocks which are defined below.

FirstFullRead true|false
Set to true if the file has to be parsed from the beginning on the
first read. If false only subsequent writes to log file will be
parsed.

Message Name
Message block contains matches to search the log file for. Each
Message block builds a notification message using matched elements
if its mandatory Match blocks are matched.

DefaultPluginInstance String
Sets the default value for the plugin instance of the notification.

DefaultType String
Sets the default value for the type of the notification.

DefaultTypeInstance String
Sets the default value for the type instance of the notification.

DefaultSeverity String
Sets the default severity. Must be set to "OK", "WARNING" or
"FAILURE". Default value is "OK".

Match Name
Multiple Match blocks define regular expression patterns for
extracting or excluding specific string patterns from parsing.
First and last Match items in the same Message set boundaries of
multiline message and are mandatory. If these matches are not
found then the whole message is discarded.

Regex Regex
Regular expression with pattern matching string. It may contain
subexpressions, so next option SubmatchIdx specifies which
subexpression should be stored.

SubmatchIdx Integer
Index of subexpression to be used for notification. Multiple
subexpressions are allowed. Index value 0 takes whole regular
expression match as a result. Index value -1 does not add result
to message item. Can be omitted, default value is 0.

Excluderegex Regex
Regular expression for excluding lines containing specific matching
strings. This is processed before checking Regex pattern. It is
optional and can be omitted.

IsMandatory true|false
Flag indicating if Match item is mandatory for message validation.
If set to true, whole message is discarded if it's missing. For
false its presence is optional. Default value is set to true.

PluginInstance true|String
If set to true, it sets plugin instance to string returned by
regex. It can be overridden by user string.

Type true|String
Sets notification type using rules like PluginInstance.

TypeInstance true|String
Sets notification type instance using rules like above.

Severity String
Sets notification severity to one of the options: "OK", "WARNING",
"FAILURE".

Plugin "log_logstash"
The log logstash plugin behaves like the logfile plugin but formats
messages as JSON events for logstash to parse and input.

LogLevel debug|info|notice|warning|err
Sets the log-level. If, for example, set to notice, then all events
with severity notice, warning, or err will be written to the
logfile.

Please note that debug is only available if collectd has been
compiled with debugging support.

Note: There is no need to notify the daemon after moving or removing
the log file (e. g. when rotating the logs). The plugin reopens the
file for each line it writes.

Plugin "lpar"
The LPAR plugin reads CPU statistics of Logical Partitions, a
virtualization technique for IBM POWER processors. It takes into
account CPU time stolen from or donated to a partition, in addition to
the usual user, system, I/O statistics.

The following configuration options are available:

CpuPoolStats false|true
When enabled, statistics about the processor pool are read, too.
The partition needs to have pool authority in order to be able to
acquire this information. Defaults to false.

ReportBySerial false|true
If enabled, the serial of the physical machine the partition is
currently running on is reported as hostname and the logical
hostname of the machine is reported in the plugin instance.
Otherwise, the logical hostname will be used (just like other
plugins) and the plugin instance will be empty. Defaults to false.

Plugin "lua"
This plugin embeds a Lua interpreter into collectd and provides an
interface to collectd's plugin system. See collectd-lua(5) for its
documentation.

Plugin "mbmon"
The "mbmon plugin" uses mbmon to retrieve temperature, voltage, etc.

Be default collectd connects to localhost (127.0.0.1), port 411/tcp.
The Host and Port options can be used to change these values, see
below. "mbmon" has to be running to work correctly. If "mbmon" is not
running timeouts may appear which may interfere with other statistics..

"mbmon" must be run with the -r option ("print TAG and Value format");
Debian's /etc/init.d/mbmon script already does this, other people will
need to ensure that this is the case.

Host Hostname
Hostname to connect to. Defaults to 127.0.0.1.

Port Port
TCP-Port to connect to. Defaults to 411.

Plugin "mdevents "
The mdevents plugin collects status changes from md (Linux software
RAID) devices.

RAID arrays are meant to allow users/administrators to keep systems up
and running, in case of common hardware problems (disk failure). Mdadm
is the standard software RAID management tool for Linux. It provides
the ability to monitor "metadata event" occurring such as disk
failures, clean-to-dirty transitions, and etc. The kernel provides the
ability to report such actions to the userspace via sysfs, and mdadm
takes action accordingly with the monitoring capability. The mdmon
polls the /sys looking for changes in the entries array_state,
sync_action, and per disk state attribute files. This is meaningful for
RAID1, 5 and 10 only.

Mdevents plugin is based on gathering RAID array events that are
written to syslog by mdadm. After registering an event, it can send a
collectd notification that contains mdadm event's data. Event consists
of event type, raid array name and, for particular events, name of
component device.

Example message:

"Jan 17 05:24:27 pc1 mdadm[188]: NewArray event detected on md device
/dev/md0"

Plugin also classifies gathered event. This means that a notification
will have a different severity {OKAY, WARNING, FAILURE} for particular
mdadm event.

For proper work, mdevents plugin needs syslog and mdadm utilities to be
present on the running system. Otherwise it will not be compiled as a
part of collectd.

Synopsis:

<Plugin mdevents>
Event ""
IgnoreEvent False
Array ""
IgnoreArray False
</Plugin>

Plugin configuration:

Mdevents plugin's configuration is mostly based on IgnoreList, which is
a collectd's utility. User can specify what particular events/RAID
arrays lie in his interest. Setting of IgnoreEvent/IgnoreArray
booleans won't take effect if Event/Array config lists are empty -
plugin will accept entry anyway.

Options:

Event "EventName"
Names of events to be monitored, separated by spaces. Possible
events include:

User should set the events that should be monitored as a strings
separated by spaces, for example Events "DeviceDisappeared Fail
DegradedArray".

IgnoreEvent false|true
If IgnoreEvent is set to true, events specified in Events will be
ignored. If it's false, only specified events will be monitored.

Array arrays
User can specify an array or a group of arrays using regexp. Plugin
will accept only RAID arrays names that start with "/dev/md".

IgnoreArray false|true
If IgnoreArray is set to true, arrays specified in Array will be
ignored. If it's false, only specified events will be monitored.

Plugin "mcelog"
The "mcelog plugin" uses mcelog to retrieve machine check exceptions.

By default the plugin connects to "/var/run/mcelog-client" to check if
the mcelog server is running. When the server is running, the plugin
will tail the specified logfile to retrieve machine check exception
information and send a notification with the details from the logfile.
The plugin will use the mcelog client protocol to retrieve memory
related machine check exceptions. Note that for memory exceptions,
notifications are only sent when there is a change in the number of
corrected/uncorrected memory errors.

The Memory block

Note: these options cannot be used in conjunction with the logfile
options, they are mutually exclusive.

McelogClientSocket Path Connect to the mcelog client socket using the
UNIX domain socket at Path. Defaults to "/var/run/mcelog-client".
PersistentNotification true|false Override default configuration to
only send notifications when sent when there is a change in the number
of corrected/uncorrected memory errors. When set to true notifications
will be sent for every read cycle. Default is false. Does not affect
the stats being dispatched.
McelogLogfile Path
The mcelog file to parse. Defaults to "/var/log/mcelog". Note: this
option cannot be used in conjunction with the memory block options,
they are mutually exclusive.

Plugin "md"
The "md plugin" collects information from Linux Software-RAID devices
(md).

All reported values are of the type "md_disks". Reported type instances
are active, failed (present but not operational), spare (hot stand-by)
and missing (physically absent) disks.

Device Device
Select md devices based on device name. The device name is the
basename of the device, i.e. the name of the block device without
the leading "/dev/". See IgnoreSelected for more details.

See /"IGNORELISTS" for details.

IgnoreSelected true|false
Invert device selection: If set to true, all md devices except
those listed using Device are collected. If false (the default),
only those listed are collected. If no configuration is given, the
md plugin will collect data from all md devices.

Plugin "memcachec"
The "memcachec plugin" connects to a memcached server, queries one or
more given pages and parses the returned data according to user
specification. The matches used are the same as the matches used in
the "curl" and "tail" plugins.

In order to talk to the memcached server, this plugin uses the
libmemcached library. Please note that there is another library with a
very similar name, libmemcache (notice the missing `d'), which is not
applicable.

Synopsis of the configuration:

<Plugin "memcachec">
<Page "plugin_instance">
Server "localhost"
Key "page_key"
Plugin "plugin_name"
<Match>
Regex "(\\d+) bytes sent"
DSType CounterAdd
Type "ipt_octets"
Instance "type_instance"
</Match>
</Page>
</Plugin>

The configuration options are:

<Page Name>
Each Page block defines one page to be queried from the memcached
server. The block requires one string argument which is used as
plugin instance.

Server Address
Sets the server address to connect to when querying the page. Must
be inside a Page block.

Key Key
When connected to the memcached server, asks for the page Key.

Plugin Plugin
Use Plugin as the plugin name when submitting values. Defaults to
"memcachec".

<Match>
Match blocks define which strings to look for and how matches
substrings are interpreted. For a description of match blocks,
please see "Plugin tail".

Plugin "memcached"
The memcached plugin connects to a memcached server and queries
statistics about cache utilization, memory and bandwidth used.
<http://memcached.org/>

<Plugin "memcached">
<Instance "name">
#Host "memcache.example.com"
Address "127.0.0.1"
Port 11211
</Instance>
</Plugin>

The plugin configuration consists of one or more Instance blocks which
specify one memcached connection each. Within the Instance blocks, the
following options are allowed:

Host Hostname
Sets the host field of dispatched values. Defaults to the global
hostname setting. For backwards compatibility, values are also
dispatched with the global hostname when Host is set to 127.0.0.1
or localhost and Address is not set.

Address Address
Hostname or IP to connect to. For backwards compatibility, defaults
to the value of Host or 127.0.0.1 if Host is unset.

Port Port
TCP port to connect to. Defaults to 11211.

Socket Path
Connect to memcached using the UNIX domain socket at Path. If this
setting is given, the Address and Port settings are ignored.

Plugin "mic"
The mic plugin gathers CPU statistics, memory usage and temperatures
from Intel's Many Integrated Core (MIC) systems.

Synopsis:

<Plugin mic>
ShowCPU true
ShowCPUCores true
ShowMemory true

ShowTemperatures true
Temperature vddg
Temperature vddq
IgnoreSelectedTemperature true

ShowPower true
Power total0
Power total1
IgnoreSelectedPower true
</Plugin>

The following options are valid inside the Plugin mic block:

ShowCPU true|false
If enabled (the default) a sum of the CPU usage across all cores is
reported.

ShowCPUCores true|false
If enabled (the default) per-core CPU usage is reported.

ShowMemory true|false
If enabled (the default) the physical memory usage of the MIC
system is reported.

ShowTemperatures true|false
If enabled (the default) various temperatures of the MIC system are
reported.

Temperature Name
This option controls which temperatures are being reported. Whether
matching temperatures are being ignored or only matching
temperatures are reported depends on the IgnoreSelectedTemperature
setting below. By default all temperatures are reported.

IgnoreSelectedTemperature false|true
Controls the behavior of the Temperature setting above. If set to
false (the default) only temperatures matching a Temperature option
are reported or, if no Temperature option is specified, all
temperatures are reported. If set to true, matching temperatures
are ignored and all other temperatures are reported.

Known temperature names are:

die Die of the CPU

devmem
Device Memory

fin Fan In

fout
Fan Out

vccp
Voltage ccp

vddg
Voltage ddg

vddq
Voltage ddq

ShowPower true|false
If enabled (the default) various temperatures of the MIC system are
reported.

Power Name
This option controls which power readings are being reported.
Whether matching power readings are being ignored or only matching
power readings are reported depends on the IgnoreSelectedPower
setting below. By default all power readings are reported.

IgnoreSelectedPower false|true
Controls the behavior of the Power setting above. If set to false
(the default) only power readings matching a Power option are
reported or, if no Power option is specified, all power readings
are reported. If set to true, matching power readings are ignored
and all other power readings are reported.

Known power names are:

total0
Total power utilization averaged over Time Window 0 (uWatts).

total1
Total power utilization averaged over Time Window 0 (uWatts).

inst
Instantaneous power (uWatts).

imax
Max instantaneous power (uWatts).

pcie
PCI-E connector power (uWatts).

c2x3
2x3 connector power (uWatts).

c2x4
2x4 connector power (uWatts).

vccp
Core rail (uVolts).

vddg
Uncore rail (uVolts).

vddq
Memory subsystem rail (uVolts).

Plugin "memory"
The memory plugin provides the following configuration options:

ValuesAbsolute true|false
Enables or disables reporting of physical memory usage in absolute
numbers, i.e. bytes. Defaults to true.

ValuesPercentage false|true
Enables or disables reporting of physical memory usage in
percentages, e.g. percent of physical memory used. Defaults to
false.

This is useful for deploying collectd in a heterogeneous
environment in which the sizes of physical memory vary.

Plugin "modbus"
The modbus plugin connects to a Modbus "slave" via Modbus/TCP or
Modbus/RTU and reads register values. It supports reading single
registers (unsigned 16 bit values), large integer values (unsigned
32 bit and 64 bit values) and floating point values (two registers
interpreted as IEEE floats in big endian notation).

Synopsis:

<Data "voltage-input-1">
RegisterBase 0
RegisterType float
RegisterCmd ReadHolding
Type voltage
Instance "input-1"
#Scale 1.0
#Shift 0.0
</Data>

<Data "voltage-input-2">
RegisterBase 2
RegisterType float
RegisterCmd ReadHolding
Type voltage
Instance "input-2"
</Data>

<Data "supply-temperature-1">
RegisterBase 0
RegisterType Int16
RegisterCmd ReadHolding
Type temperature
Instance "temp-1"
</Data>

<Host "modbus.example.com">
Address "192.168.0.42"
Port "502"
Interval 60

<Slave 1>
Instance "power-supply"
Collect "voltage-input-1"
Collect "voltage-input-2"
</Slave>
</Host>

<Host "localhost">
Device "/dev/ttyUSB0"
Baudrate 38400
Interval 20

<Slave 1>
Instance "temperature"
Collect "supply-temperature-1"
</Slave>
</Host>

<Data Name> blocks
Data blocks define a mapping between register numbers and the
"types" used by collectd.

Within <Data /> blocks, the following options are allowed:

RegisterBase Number
Configures the base register to read from the device. If the
option RegisterType has been set to Uint32 or Float, this and
the next register will be read (the register number is
increased by one).

RegisterType
Int16|Int32|Int64|Uint16|Uint32|UInt64|Float|Int32LE|Uint32LE|FloatLE
Specifies what kind of data is returned by the device. This
defaults to Uint16. If the type is Int32, Int32LE, Uint32,
Uint32LE, Float or FloatLE, two 16 bit registers at
RegisterBase and RegisterBase+1 will be read and the data is
combined into one 32 value. For Int32, Uint32 and Float the
most significant 16 bits are in the register at RegisterBase
and the least significant 16 bits are in the register at
RegisterBase+1. For Int32LE, Uint32LE, or Float32LE, the high
and low order registers are swapped with the most significant
16 bits in the RegisterBase+1 and the least significant 16 bits
in RegisterBase. If the type is Int64 or UInt64, four 16 bit
registers at RegisterBase, RegisterBase+1, RegisterBase+2 and
RegisterBase+3 will be read and the data combined into one
64 value.

RegisterCmd ReadHolding|ReadInput
Specifies register type to be collected from device. Works only
with libmodbus 2.9.2 or higher. Defaults to ReadHolding.

Type Type
Specifies the "type" (data set) to use when dispatching the
value to collectd. Currently, only data sets with exactly one
data source are supported.

Instance Instance
Sets the type instance to use when dispatching the value to
Instance. If unset, an empty string (no type instance) is used.

Scale Value
The values taken from device are multiplied by Value. The field
is optional and the default is 1.0.

Shift Value
Value is added to values from device after they have been
multiplied by Scale value. The field is optional and the
default value is 0.0.

<Host Name> blocks
Host blocks are used to specify to which hosts to connect and what
data to read from their "slaves". The string argument Name is used
as hostname when dispatching the values to collectd.

Within <Host /> blocks, the following options are allowed:

Address Hostname
For Modbus/TCP, specifies the node name (the actual network
address) used to connect to the host. This may be an IP address
or a hostname. Please note that the used libmodbus library only
supports IPv4 at the moment.

Port Service
for Modbus/TCP, specifies the port used to connect to the host.
The port can either be given as a number or as a service name.
Please note that the Service argument must be a string, even if
ports are given in their numerical form. Defaults to "502".

Device Devicenode
For Modbus/RTU, specifies the path to the serial device being
used.

Baudrate Baudrate
For Modbus/RTU, specifies the baud rate of the serial device.
Note, connections currently support only 8/N/1.

UARTType UARTType
For Modbus/RTU, specifies the type of the serial device.
RS232, RS422 and RS485 are supported. Defaults to RS232.
Available only on Linux systems with libmodbus>=2.9.4.

Interval Interval
Sets the interval (in seconds) in which the values will be
collected from this host. By default the global Interval
setting will be used.

<Slave ID>
Over each connection, multiple Modbus devices may be reached.
The slave ID is used to specify which device should be
addressed. For each device you want to query, one Slave block
must be given.

Within <Slave /> blocks, the following options are allowed:

Instance Instance
Specify the plugin instance to use when dispatching the
values to collectd. By default "slave_ID" is used.

Collect DataName
Specifies which data to retrieve from the device. DataName
must be the same string as the Name argument passed to a
Data block. You can specify this option multiple times to
collect more than one value from a slave. At least one
Collect option is mandatory.

Plugin "mqtt"
The MQTT plugin can send metrics to MQTT (Publish blocks) and receive
values from MQTT (Subscribe blocks).

Synopsis:

<Plugin mqtt>
<Publish "name">
Host "mqtt.example.com"
Prefix "collectd"
</Publish>
<Subscribe "name">
Host "mqtt.example.com"
Topic "collectd/#"
</Subscribe>
</Plugin>

The plugin's configuration is in Publish and/or Subscribe blocks,
configuring the sending and receiving direction respectively. The
plugin will register a write callback named "mqtt/name" where name is
the string argument given to the Publish block. Both types of blocks
share many but not all of the following options. If an option is valid
in only one of the blocks, it will be mentioned explicitly.

Options:

Host Hostname
Hostname of the MQTT broker to connect to.

Port Service
Port number or service name of the MQTT broker to connect to.

User UserName
Username used when authenticating to the MQTT broker.

Password Password
Password used when authenticating to the MQTT broker.

ClientId ClientId
MQTT client ID to use. Defaults to the hostname used by collectd.

QoS [0-2]
Sets the Quality of Service, with the values 0, 1 and 2 meaning:

0 At most once

1 At least once

2 Exactly once

In Publish blocks, this option determines the QoS flag set on
outgoing messages and defaults to 0. In Subscribe blocks,
determines the maximum QoS setting the client is going to accept
and defaults to 2. If the QoS flag on a message is larger than the
maximum accepted QoS of a subscriber, the message's QoS will be
downgraded.

Prefix Prefix (Publish only)
This plugin will use one topic per value list which will looks like
a path. Prefix is used as the first path element and defaults to
collectd.

An example topic name would be:

collectd/cpu-0/cpu-user

Retain false|true (Publish only)
Controls whether the MQTT broker will retain (keep a copy of) the
last message sent to each topic and deliver it to new subscribers.
Defaults to false.

StoreRates true|false (Publish only)
Controls whether "DERIVE" and "COUNTER" metrics are converted to a
rate before sending. Defaults to true.

CleanSession true|false (Subscribe only)
Controls whether the MQTT "cleans" the session up after the
subscriber disconnects or if it maintains the subscriber's
subscriptions and all messages that arrive while the subscriber is
disconnected. Defaults to true.

Topic TopicName (Subscribe only)
Configures the topic(s) to subscribe to. You can use the single
level "+" and multi level "#" wildcards. Defaults to collectd/#,
i.e. all topics beneath the collectd branch.

CACert file
Path to the PEM-encoded CA certificate file. Setting this option
enables TLS communication with the MQTT broker, and as such, Port
should be the TLS-enabled port of the MQTT broker. This option
enables the use of TLS.

CertificateFile file
Path to the PEM-encoded certificate file to use as client
certificate when connecting to the MQTT broker. Only valid if
CACert and CertificateKeyFile are also set.

CertificateKeyFile file
Path to the unencrypted PEM-encoded key file corresponding to
CertificateFile. Only valid if CACert and CertificateFile are also
set.

TLSProtocol protocol
If configured, this specifies the string protocol version (e.g.
"tlsv1", "tlsv1.2") to use for the TLS connection to the broker. If
not set a default version is used which depends on the version of
OpenSSL the Mosquitto library was linked against. Only valid if
CACert is set.

CipherSuite ciphersuite
A string describing the ciphers available for use. See ciphers(1)
and the "openssl ciphers" utility for more information. If unset,
the default ciphers will be used. Only valid if CACert is set.

Plugin "mysql"
The "mysql plugin" requires mysqlclient to be installed. It connects to
one or more databases when started and keeps the connection up as long
as possible. When the connection is interrupted for whatever reason it
will try to re-connect. The plugin will complain loudly in case
anything goes wrong.

This plugin issues the MySQL "SHOW STATUS" / "SHOW GLOBAL STATUS"
command and collects information about MySQL network traffic, executed
statements, requests, the query cache and threads by evaluating the
"Bytes_{received,sent}", "Com_*", "Handler_*", "Qcache_*" and
"Threads_*" return values. Please refer to the MySQL reference manual,
5.1.6. Server Status Variables for an explanation of these values.

Optionally, master and slave statistics may be collected in a MySQL
replication setup. In that case, information about the synchronization
state of the nodes are collected by evaluating the "Position" return
value of the "SHOW MASTER STATUS" command and the
"Seconds_Behind_Master", "Read_Master_Log_Pos" and
"Exec_Master_Log_Pos" return values of the "SHOW SLAVE STATUS" command.
See the MySQL reference manual, 12.5.5.21 SHOW MASTER STATUS Syntax and
12.5.5.31 SHOW SLAVE STATUS Syntax for details.

Synopsis:

<Plugin mysql>
<Database foo>
Host "hostname"
User "username"
Password "password"
Port "3306"
MasterStats true
ConnectTimeout 10
SSLKey "/path/to/key.pem"
SSLCert "/path/to/cert.pem"
SSLCA "/path/to/ca.pem"
SSLCAPath "/path/to/cas/"
SSLCipher "DHE-RSA-AES256-SHA"
</Database>

<Database bar>
Alias "squeeze"
Host "localhost"
Socket "/var/run/mysql/mysqld.sock"
SlaveStats true
SlaveNotifications true
</Database>

<Database galera>
Alias "galera"
Host "localhost"
Socket "/var/run/mysql/mysqld.sock"
WsrepStats true
</Database>
</Plugin>

A Database block defines one connection to a MySQL database. It accepts
a single argument which specifies the name of the database. None of the
other options are required. MySQL will use default values as documented
in the "mysql_real_connect()" and "mysql_ssl_set()" sections in the
MySQL reference manual.

Alias Alias
Alias to use as sender instead of hostname when reporting. This may
be useful when having cryptic hostnames.

Host Hostname
Hostname of the database server. Defaults to localhost.

User Username
Username to use when connecting to the database. The user does not
have to be granted any privileges (which is synonym to granting the
"USAGE" privilege), unless you want to collect replication
statistics (see MasterStats and SlaveStats below). In this case,
the user needs the "REPLICATION CLIENT" (or "SUPER") privileges.
Else, any existing MySQL user will do.

Password Password
Password needed to log into the database.

Database Database
Select this database. Defaults to no database which is a perfectly
reasonable option for what this plugin does.

Port Port
TCP-port to connect to. The port must be specified in its numeric
form, but it must be passed as a string nonetheless. For example:

Port "3306"

If Host is set to localhost (the default), this setting has no
effect. See the documentation for the "mysql_real_connect"
function for details.

Socket Socket
Specifies the path to the UNIX domain socket of the MySQL server.
This option only has any effect, if Host is set to localhost (the
default). Otherwise, use the Port option above. See the
documentation for the "mysql_real_connect" function for details.

InnodbStats true|false
If enabled, metrics about the InnoDB storage engine are collected.
Disabled by default.

MasterStats true|false
SlaveStats true|false
Enable the collection of master / slave statistics in a replication
setup. In order to be able to get access to these statistics, the
user needs special privileges. See the User documentation above.
Defaults to false.

SlaveNotifications true|false
If enabled, the plugin sends a notification if the replication
slave I/O and / or SQL threads are not running. Defaults to false.

WsrepStats true|false
Enable the collection of wsrep plugin statistics, used in Master-
Master replication setups like in MySQL Galera/Percona XtraDB
Cluster. User needs only privileges to execute 'SHOW GLOBAL
STATUS'. Defaults to false.

ConnectTimeout Seconds
Sets the connect timeout for the MySQL client.

SSLKey Path
If provided, the X509 key in PEM format.

SSLCert Path
If provided, the X509 cert in PEM format.

SSLCA Path
If provided, the CA file in PEM format (check OpenSSL docs).

SSLCAPath Path
If provided, the CA directory (check OpenSSL docs).

SSLCipher String
If provided, the SSL cipher to use.

Plugin "netapp"
The netapp plugin can collect various performance and capacity
information from a NetApp filer using the NetApp API.

Please note that NetApp has a wide line of products and a lot of
different software versions for each of these products. This plugin was
developed for a NetApp FAS3040 running OnTap 7.2.3P8 and tested on
FAS2050 7.3.1.1L1, FAS3140 7.2.5.1 and FAS3020 7.2.4P9. It should work
for most combinations of model and software version but it is very hard
to test this. If you have used this plugin with other models and/or
software version, feel free to send us a mail to tell us about the
results, even if it's just a short "It works".

To collect these data collectd will log in to the NetApp via HTTP(S)
and HTTP basic authentication.

Do not use a regular user for this! Create a special collectd user with
just the minimum of capabilities needed. The user only needs the
"login-http-admin" capability as well as a few more depending on which
data will be collected. Required capabilities are documented below.

Synopsis

<Plugin "netapp">
<Host "netapp1.example.com">
Protocol "https"
Address "10.0.0.1"
Port 443
User "username"
Password "aef4Aebe"
Interval 30

<WAFL>
Interval 30
GetNameCache true
GetDirCache true
GetBufferCache true
GetInodeCache true
</WAFL>

<Disks>
Interval 30
GetBusy true
</Disks>

<VolumePerf>
Interval 30
GetIO "volume0"
IgnoreSelectedIO false
GetOps "volume0"
IgnoreSelectedOps false
GetLatency "volume0"
IgnoreSelectedLatency false
</VolumePerf>

<VolumeUsage>
Interval 30
GetCapacity "vol0"
GetCapacity "vol1"
IgnoreSelectedCapacity false
GetSnapshot "vol1"
GetSnapshot "vol3"
IgnoreSelectedSnapshot false
</VolumeUsage>

<Quota>
Interval 60
</Quota>

<Snapvault>
Interval 30
</Snapvault>

<System>
Interval 30
GetCPULoad true
GetInterfaces true
GetDiskOps true
GetDiskIO true
</System>

<VFiler vfilerA>
Interval 60

SnapVault true
# ...
</VFiler>
</Host>
</Plugin>

The netapp plugin accepts the following configuration options:

Host Name
A host block defines one NetApp filer. It will appear in collectd
with the name you specify here which does not have to be its real
name nor its hostname (see the Address option below).

VFiler Name
A VFiler block may only be used inside a host block. It accepts all
the same options as the Host block (except for cascaded VFiler
blocks) and will execute all NetApp API commands in the context of
the specified VFiler(R). It will appear in collectd with the name
you specify here which does not have to be its real name. The
VFiler name may be specified using the VFilerName option. If this
is not specified, it will default to the name you specify here.

The VFiler block inherits all connection related settings from the
surrounding Host block (which appear before the VFiler block) but
they may be overwritten inside the VFiler block.

This feature is useful, for example, when using a VFiler as
SnapVault target (supported since OnTap 8.1). In that case, the
SnapVault statistics are not available in the host filer (vfiler0)
but only in the respective VFiler context.

Protocol httpd|http
The protocol collectd will use to query this host.

Optional

Type: string

Default: https

Valid options: http, https

Address Address
The hostname or IP address of the host.

Optional

Type: string

Default: The "host" block's name.

Port Port
The TCP port to connect to on the host.

Optional

Type: integer

Default: 80 for protocol "http", 443 for protocol "https"

User User
Password Password
The username and password to use to login to the NetApp.

Mandatory

Type: string

VFilerName Name
The name of the VFiler in which context to execute API commands. If
not specified, the name provided to the VFiler block will be used
instead.

Optional

Type: string

Default: name of the VFiler block

Note: This option may only be used inside VFiler blocks.

Interval Interval
TODO

The following options decide what kind of data will be collected. You
can either use them as a block and fine tune various parameters inside
this block, use them as a single statement to just accept all default
values, or omit it to not collect any data.

The following options are valid inside all blocks:

Interval Seconds
Collect the respective statistics every Seconds seconds. Defaults
to the host specific setting.

The System block

This will collect various performance data about the whole system.

Note: To get this data the collectd user needs the "api-perf-object-
get-instances" capability.

Interval Seconds
Collect disk statistics every Seconds seconds.

GetCPULoad true|false
If you set this option to true the current CPU usage will be read.
This will be the average usage between all CPUs in your NetApp
without any information about individual CPUs.

Note: These are the same values that the NetApp CLI command
"sysstat" returns in the "CPU" field.

Optional

Type: boolean

Default: true

Result: Two value lists of type "cpu", and type instances "idle"
and "system".

GetInterfaces true|false
If you set this option to true the current traffic of the network
interfaces will be read. This will be the total traffic over all
interfaces of your NetApp without any information about individual
interfaces.

Note: This is the same values that the NetApp CLI command "sysstat"
returns in the "Net kB/s" field.

Or is it?

Optional

Type: boolean

Default: true

Result: One value list of type "if_octects".

GetDiskIO true|false
If you set this option to true the current IO throughput will be
read. This will be the total IO of your NetApp without any
information about individual disks, volumes or aggregates.

Note: This is the same values that the NetApp CLI command "sysstat"
returns in the "Disk kB/s" field.

Optional

Type: boolean

Default: true

Result: One value list of type "disk_octets".

GetDiskOps true|false
If you set this option to true the current number of HTTP, NFS,
CIFS, FCP, iSCSI, etc. operations will be read. This will be the
total number of operations on your NetApp without any information
about individual volumes or aggregates.

Note: These are the same values that the NetApp CLI command
"sysstat" returns in the "NFS", "CIFS", "HTTP", "FCP" and "iSCSI"
fields.

Optional

Type: boolean

Default: true

Result: A variable number of value lists of type
"disk_ops_complex". Each type of operation will result in one value
list with the name of the operation as type instance.

The WAFL block

This will collect various performance data about the WAFL file system.
At the moment this just means cache performance.

Note: To get this data the collectd user needs the "api-perf-object-
get-instances" capability.

Note: The interface to get these values is classified as "Diagnostics"
by NetApp. This means that it is not guaranteed to be stable even
between minor releases.

Interval Seconds
Collect disk statistics every Seconds seconds.

GetNameCache true|false
Optional

Type: boolean

Default: true

Result: One value list of type "cache_ratio" and type instance
"name_cache_hit".

GetDirCache true|false
Optional

Type: boolean

Default: true

Result: One value list of type "cache_ratio" and type instance
"find_dir_hit".

GetInodeCache true|false
Optional

Type: boolean

Default: true

Result: One value list of type "cache_ratio" and type instance
"inode_cache_hit".

GetBufferCache true|false
Note: This is the same value that the NetApp CLI command "sysstat"
returns in the "Cache hit" field.

Optional

Type: boolean

Default: true

Result: One value list of type "cache_ratio" and type instance
"buf_hash_hit".

The Disks block

This will collect performance data about the individual disks in the
NetApp.

Note: To get this data the collectd user needs the "api-perf-object-
get-instances" capability.

Interval Seconds
Collect disk statistics every Seconds seconds.

GetBusy true|false
If you set this option to true the busy time of all disks will be
calculated and the value of the busiest disk in the system will be
written.

Note: This is the same values that the NetApp CLI command "sysstat"
returns in the "Disk util" field. Probably.

Optional

Type: boolean

Default: true

Result: One value list of type "percent" and type instance
"disk_busy".

The VolumePerf block

This will collect various performance data about the individual
volumes.

You can select which data to collect about which volume using the
following options. They follow the standard ignorelist semantic.

Note: To get this data the collectd user needs the api-perf-object-get-
instances capability.

Interval Seconds
Collect volume performance data every Seconds seconds.

GetIO Volume
GetOps Volume
GetLatency Volume
Select the given volume for IO, operations or latency statistics
collection. The argument is the name of the volume without the
"/vol/" prefix.

Since the standard ignorelist functionality is used here, you can
use a string starting and ending with a slash to specify regular
expression matching: To match the volumes "vol0", "vol2" and
"vol7", you can use this regular expression:

GetIO "/^vol[027]$/"

If no regular expression is specified, an exact match is required.
Both, regular and exact matching are case sensitive.

If no volume was specified at all for either of the three options,
that data will be collected for all available volumes.

See /"IGNORELISTS" for details.

IgnoreSelectedIO true|false
IgnoreSelectedOps true|false
IgnoreSelectedLatency true|false
When set to true, the volumes selected for IO, operations or
latency statistics collection will be ignored and the data will be
collected for all other volumes.

When set to false, data will only be collected for the specified
volumes and all other volumes will be ignored.

If no volumes have been specified with the above Get* options, all
volumes will be collected regardless of the IgnoreSelected* option.

Defaults to false

The VolumeUsage block

This will collect capacity data about the individual volumes.

Note: To get this data the collectd user needs the api-volume-list-info
capability.

Interval Seconds
Collect volume usage statistics every Seconds seconds.

GetCapacity VolumeName
The current capacity of the volume will be collected. This will
result in two to four value lists, depending on the configuration
of the volume. All data sources are of type "df_complex" with the
name of the volume as plugin_instance.

There will be type_instances "used" and "free" for the number of
used and available bytes on the volume. If the volume has some
space reserved for snapshots, a type_instance "snap_reserved" will
be available. If the volume has SIS enabled, a type_instance
"sis_saved" will be available. This is the number of bytes saved by
the SIS feature.

Note: The current NetApp API has a bug that results in this value
being reported as a 32 bit number. This plugin tries to guess the
correct number which works most of the time. If you see strange
values here, bug NetApp support to fix this.

Repeat this option to specify multiple volumes.

IgnoreSelectedCapacity true|false
Specify whether to collect only the volumes selected by the
GetCapacity option or to ignore those volumes.
IgnoreSelectedCapacity defaults to false. However, if no
GetCapacity option is specified at all, all capacities will be
selected anyway.

GetSnapshot VolumeName
Select volumes from which to collect snapshot information.

Usually, the space used for snapshots is included in the space
reported as "used". If snapshot information is collected as well,
the space used for snapshots is subtracted from the used space.

To make things even more interesting, it is possible to reserve
space to be used for snapshots. If the space required for snapshots
is less than that reserved space, there is "reserved free" and
"reserved used" space in addition to "free" and "used". If the
space required for snapshots exceeds the reserved space, that part
allocated in the normal space is subtracted from the "used" space
again.

Repeat this option to specify multiple volumes.

IgnoreSelectedSnapshot
Specify whether to collect only the volumes selected by the
GetSnapshot option or to ignore those volumes.
IgnoreSelectedSnapshot defaults to false. However, if no
GetSnapshot option is specified at all, all capacities will be
selected anyway.

The Quota block

This will collect (tree) quota statistics (used disk space and number
of used files). This mechanism is useful to get usage information for
single qtrees. In case the quotas are not used for any other purpose,
an entry similar to the following in "/etc/quotas" would be sufficient:

/vol/volA/some_qtree tree - - - - -

After adding the entry, issue "quota on -w volA" on the NetApp filer.

Interval Seconds
Collect SnapVault(R) statistics every Seconds seconds.

The SnapVault block

This will collect statistics about the time and traffic of SnapVault(R)
transfers.

Interval Seconds
Collect SnapVault(R) statistics every Seconds seconds.

Plugin "netlink"
The "netlink" plugin uses a netlink socket to query the Linux kernel
about statistics of various interface and routing aspects.

Interface Interface
VerboseInterface Interface
Instruct the plugin to collect interface statistics. This is
basically the same as the statistics provided by the "interface"
plugin (see above) but potentially much more detailed.

When configuring with Interface only the basic statistics will be
collected, namely octets, packets, and errors. These statistics are
collected by the "interface" plugin, too, so using both at the same
time is no benefit.

When configured with VerboseInterface all counters except the basic
ones will be collected, so that no data needs to be collected twice
if you use the "interface" plugin. This includes dropped packets,
received multicast packets, collisions and a whole zoo of
differentiated RX and TX errors. You can try the following command
to get an idea of what awaits you:

ip -s -s link list

If Interface is All, all interfaces will be selected.

Interface "/^eth/"
Interface "/^ens[1-4]$|^enp[0-3]$/"
VerboseInterface "/^eno[0-9]+/"

This will match all interfaces with names starting with eth, all
interfaces in range ens1 - ens4 and enp0 - enp3, and for verbose
metrics all interfaces with names starting with eno followed by at
least one digit.

QDisc Interface [QDisc]
Class Interface [Class]
Filter Interface [Filter]
Collect the octets and packets that pass a certain qdisc, class or
filter.

QDiscs and classes are identified by their type and handle (or
classid). Filters don't necessarily have a handle, therefore the
parent's handle is used. The notation used in collectd differs
from that used in tc(1) in that it doesn't skip the major or minor
number if it's zero and doesn't print special ids by their name.
So, for example, a qdisc may be identified by "pfifo_fast-1:0" even
though the minor number of all qdiscs is zero and thus not
displayed by tc(1).

If QDisc, Class, or Filter is given without the second argument,
i. .e. without an identifier, all qdiscs, classes, or filters that
are associated with that interface will be collected.

Since a filter itself doesn't necessarily have a handle, the
parent's handle is used. This may lead to problems when more than
one filter is attached to a qdisc or class. This isn't nice, but we
don't know how this could be done any better. If you have a idea,
please don't hesitate to tell us.

As with the Interface option you can specify All as the interface,
meaning all interfaces.

Here are some examples to help you understand the above text more
easily:

<Plugin netlink>
VerboseInterface "All"
QDisc "eth0" "pfifo_fast-1:0"
QDisc "ppp0"
Class "ppp0" "htb-1:10"
Filter "ppp0" "u32-1:0"
</Plugin>

See /"IGNORELISTS" for details.

IgnoreSelected
The behavior is the same as with all other similar plugins: If
nothing is selected at all, everything is collected. If some things
are selected using the options described above, only these
statistics are collected. If you set IgnoreSelected to true, this
behavior is inverted, i. e. the specified statistics will not be
collected.

CollectVFStats true|false
Allow plugin to collect VF's statistics if there are Virtual
Functions available for interfaces specified in Interface or
VerboseInterface. All available stats are collected no matter if
parent interface is set by Interface or VerboseInterface.

Plugin "network"
The Network plugin sends data to a remote instance of collectd,
receives data from a remote instance, or both at the same time. Data
which has been received from the network is usually not transmitted
again, but this can be activated, see the Forward option below.

The default IPv6 multicast group is "ff18::efc0:4a42". The default IPv4
multicast group is 239.192.74.66. The default UDP port is 25826.

Both, Server and Listen can be used as single option or as block. When
used as block, given options are valid for this socket only. The
following example will export the metrics twice: Once to an "internal"
server (without encryption and signing) and one to an external server
(with cryptographic signature):

<Plugin "network">
# Export to an internal server
# (demonstrates usage without additional options)
Server "collectd.internal.tld"

# Export to an external server
# (demonstrates usage with signature options)
<Server "collectd.external.tld">
SecurityLevel "sign"
Username "myhostname"
Password "ohl0eQue"
</Server>
</Plugin>

<Server Host [Port]>
The Server statement/block sets the server to send datagrams to.
The statement may occur multiple times to send each datagram to
multiple destinations.

The argument Host may be a hostname, an IPv4 address or an IPv6
address. The optional second argument specifies a port number or a
service name. If not given, the default, 25826, is used.

The following options are recognized within Server blocks:

SecurityLevel Encrypt|Sign|None
Set the security you require for network communication. When
the security level has been set to Encrypt, data sent over the
network will be encrypted using AES-256. The integrity of
encrypted packets is ensured using SHA-1. When set to Sign,
transmitted data is signed using the HMAC-SHA-256 message
authentication code. When set to None, data is sent without any
security.

This feature is only available if the network plugin was linked
with libgcrypt.

Username Username
Sets the username to transmit. This is used by the server to
lookup the password. See AuthFile below. All security levels
except None require this setting.

This feature is only available if the network plugin was linked
with libgcrypt.

Password Password
Sets a password (shared secret) for this socket. All security
levels except None require this setting.

This feature is only available if the network plugin was linked
with libgcrypt.

Interface Interface name
Set the outgoing interface for IP packets. This applies at
least to IPv6 packets and if possible to IPv4. If this option
is not applicable, undefined or a non-existent interface name
is specified, the default behavior is to let the kernel choose
the appropriate interface. Be warned that the manual selection
of an interface for unicast traffic is only necessary in rare
cases.

BindAddress IP Address
Set the outgoing IP address for IP packets. This option can be
used instead of the Interface option to explicitly define the
IP address which will be used to send Packets to the remote
server.

ResolveInterval Seconds
Sets the interval at which to re-resolve the DNS for the Host.
This is useful to force a regular DNS lookup to support a high
availability setup. If not specified, re-resolves are never
attempted.

<Listen Host [Port]>
The Listen statement sets the interfaces to bind to. When multiple
statements are found the daemon will bind to multiple interfaces.

The argument Host may be a hostname, an IPv4 address or an IPv6
address. If the argument is a multicast address the daemon will
join that multicast group. The optional second argument specifies
a port number or a service name. If not given, the default, 25826,
is used.

The following options are recognized within "<Listen>" blocks:

SecurityLevel Encrypt|Sign|None
Set the security you require for network communication. When
the security level has been set to Encrypt, only encrypted data
will be accepted. The integrity of encrypted packets is ensured
using SHA-1. When set to Sign, only signed and encrypted data
is accepted. When set to None, all data will be accepted. If an
AuthFile option was given (see below), encrypted data is
decrypted if possible.

This feature is only available if the network plugin was linked
with libgcrypt.

AuthFile Filename
Sets a file in which usernames are mapped to passwords. These
passwords are used to verify signatures and to decrypt
encrypted network packets. If SecurityLevel is set to None,
this is optional. If given, signed data is verified and
encrypted packets are decrypted. Otherwise, signed data is
accepted without checking the signature and encrypted data
cannot be decrypted. For the other security levels this option
is mandatory.

The file format is very simple: Each line consists of a
username followed by a colon and any number of spaces followed
by the password. To demonstrate, an example file could look
like this:

user0: foo
user1: bar

Each time a packet is received, the modification time of the
file is checked using stat(2). If the file has been changed,
the contents is re-read. While the file is being read, it is
locked using fcntl(2).

Interface Interface name
Set the incoming interface for IP packets explicitly. This
applies at least to IPv6 packets and if possible to IPv4. If
this option is not applicable, undefined or a non-existent
interface name is specified, the default behavior is, to let
the kernel choose the appropriate interface. Thus incoming
traffic gets only accepted, if it arrives on the given
interface.

TimeToLive 1-255
Set the time-to-live of sent packets. This applies to all, unicast
and multicast, and IPv4 and IPv6 packets. The default is to not
change this value. That means that multicast packets will be sent
with a TTL of 1 (one) on most operating systems.

MaxPacketSize 1024-65535
Set the maximum size for datagrams received over the network.
Packets larger than this will be truncated. Defaults to 1452 bytes,
which is the maximum payload size that can be transmitted in one
Ethernet frame using IPv6 / UDP.

On the server side, this limit should be set to the largest value
used on any client. Likewise, the value on the client must not be
larger than the value on the server, or data will be lost.

Compatibility: Versions prior to version 4.8 used a fixed sized
buffer of 1024 bytes. Versions 4.8, 4.9 and 4.10 used a default
value of 1024 bytes to avoid problems when sending data to an older
server.

Forward true|false
If set to true, write packets that were received via the network
plugin to the sending sockets. This should only be activated when
the Listen- and Server-statements differ. Otherwise packets may be
send multiple times to the same multicast group. While this results
in more network traffic than necessary it's not a huge problem
since the plugin has a duplicate detection, so the values will not
loop.

ReportStats true|false
The network plugin cannot only receive and send statistics, it can
also create statistics about itself. Collectd data included the
number of received and sent octets and packets, the length of the
receive queue and the number of values handled. When set to true,
the Network plugin will make these statistics available. Defaults
to false.

Plugin "nfs"
The nfs plugin collects information about the usage of the Network File
System (NFS). It counts the number of procedure calls for each
procedure, grouped by version and whether the system runs as server or
client.

It is possibly to omit metrics for a specific NFS version by setting
one or more of the following options to false (all of them default to
true).

ReportV2 true|false
ReportV3 true|false
ReportV4 true|false

Plugin "nginx"
This plugin collects the number of connections and requests handled by
the "nginx daemon" (speak: engine X), a HTTP and mail server/proxy. It
queries the page provided by the "ngx_http_stub_status_module" module,
which isn't compiled by default. Please refer to
<http://wiki.codemongers.com/NginxStubStatusModule> for more
information on how to compile and configure nginx and this module.

The following options are accepted by the "nginx plugin":

URL http://host/nginx_status
Sets the URL of the "ngx_http_stub_status_module" output.

User Username
Optional user name needed for authentication.

Password Password
Optional password needed for authentication.

VerifyPeer true|false
Enable or disable peer SSL certificate verification. See
<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by
default.

Timeout Milliseconds
The Timeout option sets the overall timeout for HTTP requests to
URL, in milliseconds. By default, the configured Interval is used
to set the timeout.

Plugin "notify_desktop"
This plugin sends a desktop notification to a notification daemon, as
defined in the Desktop Notification Specification. To actually display
the notifications, notification-daemon is required and collectd has to
be able to access the X server (i. e., the "DISPLAY" and "XAUTHORITY"
environment variables have to be set correctly) and the D-Bus message
bus.

The Desktop Notification Specification can be found at
<http://www.galago-project.org/specs/notification/>.

OkayTimeout timeout
WarningTimeout timeout
FailureTimeout timeout
Set the timeout, in milliseconds, after which to expire the
notification for "OKAY", "WARNING" and "FAILURE" severities
respectively. If zero has been specified, the displayed
notification will not be closed at all - the user has to do so
herself. These options default to 5000. If a negative number has
been specified, the default is used as well.

Plugin "notify_email"
The notify_email plugin uses the ESMTP library to send notifications to
a configured email address.

libESMTP is available from <http://www.stafford.uklinux.net/libesmtp/>.

Available configuration options:

From Address
Email address from which the emails should appear to come from.

Default: "root@localhost"

Recipient Address
Configures the email address(es) to which the notifications should
be mailed. May be repeated to send notifications to multiple
addresses.

At least one Recipient must be present for the plugin to work
correctly.

SMTPServer Hostname
Hostname of the SMTP server to connect to.

Default: "localhost"

SMTPPort Port
TCP port to connect to.

Default: 25

SMTPUser Username
Username for ASMTP authentication. Optional.

SMTPPassword Password
Password for ASMTP authentication. Optional.

Subject Subject
Subject-template to use when sending emails. There must be exactly
two string-placeholders in the subject, given in the standard
printf(3) syntax, i. e. %s. The first will be replaced with the
severity, the second with the hostname.

Default: "Collectd notify: %s@%s"

Plugin "notify_nagios"
The notify_nagios plugin writes notifications to Nagios' command file
as a passive service check result.

Available configuration options:

CommandFile Path
Sets the command file to write to. Defaults to
/usr/local/nagios/var/rw/nagios.cmd.

Plugin "ntpd"
The "ntpd" plugin collects per-peer ntp data such as time offset and
time dispersion.

For talking to ntpd, it mimics what the ntpdc control program does on
the wire - using mode 7 specific requests. This mode is deprecated with
newer ntpd releases (4.2.7p230 and later). For the "ntpd" plugin to
work correctly with them, the ntp daemon must be explicitly configured
to enable mode 7 (which is disabled by default). Refer to the
ntp.conf(5) manual page for details.

Available configuration options for the "ntpd" plugin:

Host Hostname
Hostname of the host running ntpd. Defaults to localhost.

Port Port
UDP-Port to connect to. Defaults to 123.

ReverseLookups true|false
Sets whether or not to perform reverse lookups on peers. Since the
name or IP-address may be used in a filename it is recommended to
disable reverse lookups. The default is to do reverse lookups to
preserve backwards compatibility, though.

IncludeUnitID true|false
When a peer is a refclock, include the unit ID in the type
instance. Defaults to false for backward compatibility.

If two refclock peers use the same driver and this is false, the
plugin will try to write simultaneous measurements from both to the
same type instance. This will result in error messages in the log
and only one set of measurements making it through.

Plugin "nut"
UPS upsname@hostname[:port]
Add a UPS to collect data from. The format is identical to the one
accepted by upsc(8).

ForceSSL true|false
Stops connections from falling back to unsecured if an SSL
connection cannot be established. Defaults to false if undeclared.

VerifyPeer true|false
If set to true, requires a CAPath be provided. Will use the CAPath
to find certificates to use as Trusted Certificates to validate a
upsd server certificate. If validation of the upsd server
certificate fails, the connection will not be established. If
ForceSSL is undeclared or set to false, setting VerifyPeer to true
will override and set ForceSSL to true.

CAPath I/path/to/certs/folder
If VerifyPeer is set to true, this is required. Otherwise this is
ignored. The folder pointed at must contain certificate(s) named
according to their hash. Ex: XXXXXXXX.Y where X is the hash value
of a cert and Y is 0. If name collisions occur because two
different certs have the same hash value, Y can be incremented in
order to avoid conflict. To create a symbolic link to a certificate
the following command can be used from within the directory where
the cert resides:

"ln -s some.crt ./$(openssl x509 -hash -noout -in some.crt).0"

Alternatively, the package openssl-perl provides a command
"c_rehash" that will generate links like the one described above
for ALL certs in a given folder. Example usage: "c_rehash
/path/to/certs/folder"

ConnectTimeout Milliseconds
The ConnectTimeout option sets the connect timeout, in
milliseconds. By default, the configured Interval is used to set
the timeout.

Plugin "olsrd"
The olsrd plugin connects to the TCP port opened by the txtinfo plugin
of the Optimized Link State Routing daemon and reads information about
the current state of the meshed network.

The following configuration options are understood:

Host Host
Connect to Host. Defaults to "localhost".

Port Port
Specifies the port to connect to. This must be a string, even if
you give the port as a number rather than a service name. Defaults
to "2006".

CollectLinks No|Summary|Detail
Specifies what information to collect about links, i. e. direct
connections of the daemon queried. If set to No, no information is
collected. If set to Summary, the number of links and the average
of all link quality (LQ) and neighbor link quality (NLQ) values is
calculated. If set to Detail LQ and NLQ are collected per link.

Defaults to Detail.

CollectRoutes No|Summary|Detail
Specifies what information to collect about routes of the daemon
queried. If set to No, no information is collected. If set to
Summary, the number of routes and the average metric and ETX is
calculated. If set to Detail metric and ETX are collected per
route.

Defaults to Summary.

CollectTopology No|Summary|Detail
Specifies what information to collect about the global topology. If
set to No, no information is collected. If set to Summary, the
number of links in the entire topology and the average link quality
(LQ) is calculated. If set to Detail LQ and NLQ are collected for
each link in the entire topology.

Defaults to Summary.

Plugin "onewire"
EXPERIMENTAL! See notes below.

The "onewire" plugin uses the owcapi library from the owfs project
<http://owfs.org/> to read sensors connected via the onewire bus.

It can be used in two possible modes - standard or advanced.

In the standard mode only temperature sensors (sensors with the family
code 10, 22 and 28 - e.g. DS1820, DS18S20, DS1920) can be read. If you
have other sensors you would like to have included, please send a sort
request to the mailing list. You can select sensors to be read or to be
ignored depending on the option IgnoreSelected). When no list is
provided the whole bus is walked and all sensors are read.

Hubs (the DS2409 chips) are working, but read the note, why this plugin
is experimental, below.

In the advanced mode you can configure any sensor to be read (only
numerical value) using full OWFS path (e.g.
"/uncached/10.F10FCA000800/temperature"). In this mode you have to
list all the sensors. Neither default bus walk nor IgnoreSelected are
used here. Address and type (file) is extracted from the path
automatically and should produce compatible structure with the
"standard" mode (basically the path is expected as for example
"/uncached/10.F10FCA000800/temperature" where it would extract address
part "F10FCA000800" and the rest after the slash is considered the type
- here "temperature"). There are two advantages to this mode - you can
access virtually any sensor (not just temperature), select whether to
use cached or directly read values and it is slighlty faster. The
downside is more complex configuration.

The two modes are distinguished automatically by the format of the
address. It is not possible to mix the two modes. Once a full path is
detected in any Sensor then the whole addressing (all sensors) is
considered to be this way (and as standard addresses will fail parsing
they will be ignored).

Device Device
Sets the device to read the values from. This can either be a
"real" hardware device, such as a serial port or an USB port, or
the address of the owserver(1) socket, usually localhost:4304.

Though the documentation claims to automatically recognize the
given address format, with version 2.7p4 we had to specify the type
explicitly. So with that version, the following configuration
worked for us:

<Plugin onewire>
Device "-s localhost:4304"
</Plugin>

This directive is required and does not have a default value.

Sensor Sensor
In the standard mode selects sensors to collect or to ignore
(depending on IgnoreSelected, see below). Sensors are specified
without the family byte at the beginning, so you have to use for
example "F10FCA000800", and not include the leading 10. family byte
and point. When no Sensor is configured the whole Onewire bus is
walked and all supported sensors (see above) are read.

In the advanced mode the Sensor specifies full OWFS path - e.g.
"/uncached/10.F10FCA000800/temperature" (or when cached values are
OK "/10.F10FCA000800/temperature"). IgnoreSelected is not used.

As there can be multiple devices on the bus you can list multiple
sensor (use multiple Sensor elements).

See /"IGNORELISTS" for details.

IgnoreSelected true|false
If no configuration is given, the onewire plugin will collect data
from all sensors found. This may not be practical, especially if
sensors are added and removed regularly. Sometimes, however, it's
easier/preferred to collect only specific sensors or all sensors
except a few specified ones. This option enables you to do that: By
setting IgnoreSelected to true the effect of Sensor is inverted:
All selected interfaces are ignored and all other interfaces are
collected.

Used only in the standard mode - see above.

Interval Seconds
Sets the interval in which all sensors should be read. If not
specified, the global Interval setting is used.

EXPERIMENTAL! The "onewire" plugin is experimental, because it doesn't
yet work with big setups. It works with one sensor being attached to
one controller, but as soon as you throw in a couple more senors and
maybe a hub or two, reading all values will take more than ten seconds
(the default interval). We will probably add some separate thread for
reading the sensors and some cache or something like that, but it's not
done yet. We will try to maintain backwards compatibility in the
future, but we can't promise. So in short: If it works for you: Great!
But keep in mind that the config might change, though this is unlikely.
Oh, and if you want to help improving this plugin, just send a short
notice to the mailing list. Thanks :)

Plugin "openldap"
To use the "openldap" plugin you first need to configure the OpenLDAP
server correctly. The backend database "monitor" needs to be loaded and
working. See slapd-monitor(5) for the details.

The configuration of the "openldap" plugin consists of one or more
Instance blocks. Each block requires one string argument as the
instance name. For example:

<Plugin "openldap">
<Instance "foo">
URL "ldap://localhost/"
</Instance>
<Instance "bar">
URL "ldaps://localhost/"
</Instance>
</Plugin>

The following options are accepted within each Instance block:

URL ldap://host/binddn
Sets the URL to use to connect to the OpenLDAP server. This option
is mandatory.

BindDN BindDN
Name in the form of an LDAP distinguished name intended to be used
for authentication. Defaults to empty string to establish an
anonymous authorization.

Password Password
Password for simple bind authentication. If this option is not set,
unauthenticated bind operation is used.

StartTLS true|false
Defines whether TLS must be used when connecting to the OpenLDAP
server. Disabled by default.

VerifyHost true|false
Enables or disables peer host name verification. If enabled, the
plugin checks if the "Common Name" or a "Subject Alternate Name"
field of the SSL certificate matches the host name provided by the
URL option. If this identity check fails, the connection is
aborted. Enabled by default.

CACert File
File that holds one or more SSL certificates. If you want to use
TLS/SSL you may possibly need this option. What CA certificates are
checked by default depends on the distribution you use and can be
changed with the usual ldap client configuration mechanisms. See
ldap.conf(5) for the details.

Timeout Seconds
Sets the timeout value for ldap operations, in seconds. By default,
the configured Interval is used to set the timeout. Use -1 to
disable (infinite timeout).

Version Version
An integer which sets the LDAP protocol version number to use when
connecting to the OpenLDAP server. Defaults to 3 for using LDAPv3.

Plugin "openvpn"
The OpenVPN plugin reads a status file maintained by OpenVPN and
gathers traffic statistics about connected clients.

To set up OpenVPN to write to the status file periodically, use the
--status option of OpenVPN.

So, in a nutshell you need:

openvpn $OTHER_OPTIONS \
--status "/var/run/openvpn-status" 10

Available options:

StatusFile File
Specifies the location of the status file.

ImprovedNamingSchema true|false
When enabled, the filename of the status file will be used as
plugin instance and the client's "common name" will be used as type
instance. This is required when reading multiple status files.
Enabling this option is recommended, but to maintain backwards
compatibility this option is disabled by default.

CollectCompression true|false
Sets whether or not statistics about the compression used by
OpenVPN should be collected. This information is only available in
single mode. Enabled by default.

CollectIndividualUsers true|false
Sets whether or not traffic information is collected for each
connected client individually. If set to false, currently no
traffic data is collected at all because aggregating this data in a
save manner is tricky. Defaults to true.

CollectUserCount true|false
When enabled, the number of currently connected clients or users is
collected. This is especially interesting when
CollectIndividualUsers is disabled, but can be configured
independently from that option. Defaults to false.

Plugin "oracle"
The "oracle" plugin uses the OracleX Call Interface (OCI) to connect to
an OracleX Database and lets you execute SQL statements there. It is
very similar to the "dbi" plugin, because it was written around the
same time. See the "dbi" plugin's documentation above for details.

<Plugin oracle>
<Query "out_of_stock">
Statement "SELECT category, COUNT(*) AS value FROM products WHERE in_stock = 0 GROUP BY category"
<Result>
Type "gauge"
# InstancePrefix "foo"
InstancesFrom "category"
ValuesFrom "value"
</Result>
</Query>
<Database "product_information">
#Plugin "warehouse"
ConnectID "db01"
Username "oracle"
Password "secret"
Query "out_of_stock"
</Database>
</Plugin>

Query blocks

The Query blocks are handled identically to the Query blocks of the
"dbi" plugin. Please see its documentation above for details on how to
specify queries.

Database blocks

Database blocks define a connection to a database and which queries
should be sent to that database. Each database needs a "name" as string
argument in the starting tag of the block. This name will be used as
"PluginInstance" in the values submitted to the daemon. Other than
that, that name is not used.

Plugin Plugin
Use Plugin as the plugin name when submitting query results from
this Database. Defaults to "oracle".

ConnectID ID
Defines the "database alias" or "service name" to connect to.
Usually, these names are defined in the file named
"$ORACLE_HOME/network/admin/tnsnames.ora".

Host Host
Hostname to use when dispatching values for this database. Defaults
to using the global hostname of the collectd instance.

Username Username
Username used for authentication.

Password Password
Password used for authentication.

Plugin "ovs_events"
The ovs_events plugin monitors the link status of Open vSwitch (OVS)
connected interfaces, dispatches the values to collectd and sends the
notification whenever the link state change occurs. This plugin uses
OVS database to get a link state change notification.

Synopsis:

<Plugin "ovs_events">
Port 6640
Address "127.0.0.1"
Socket "/var/run/openvswitch/db.sock"
Interfaces "br0" "veth0"
SendNotification true
DispatchValues false
</Plugin>

The plugin provides the following configuration options:

Address node
The address of the OVS DB server JSON-RPC interface used by the
plugin. To enable the interface, OVS DB daemon should be running
with "--remote=ptcp:" option. See ovsdb-server(1) for more details.
The option may be either network hostname, IPv4 numbers-and-dots
notation or IPv6 hexadecimal string format. Defaults to
"localhost".

Port service
TCP-port to connect to. Either a service name or a port number may
be given. Defaults to 6640.

Socket path
The UNIX domain socket path of OVS DB server JSON-RPC interface
used by the plugin. To enable the interface, the OVS DB daemon
should be running with "--remote=punix:" option. See
ovsdb-server(1) for more details. If this option is set, Address
and Port options are ignored.

Interfaces [ifname ...]
List of interface names to be monitored by this plugin. If this
option is not specified or is empty then all OVS connected
interfaces on all bridges are monitored.

Default: empty (all interfaces on all bridges are monitored)

SendNotification true|false
If set to true, OVS link notifications (interface status and OVS DB
connection terminate) are sent to collectd. Default value is true.

DispatchValues true|false
Dispatch the OVS DB interface link status value with configured
plugin interval. Defaults to false. Please note, if
SendNotification and DispatchValues options are false, no OVS
information will be provided by the plugin.

Note: By default, the global interval setting is used within which to
retrieve the OVS link status. To configure a plugin-specific interval,
please use Interval option of the OVS LoadPlugin block settings. For
milliseconds simple divide the time by 1000 for example if the desired
interval is 50ms, set interval to 0.05.

Plugin "ovs_stats"
The ovs_stats plugin collects statistics of OVS connected interfaces.
This plugin uses OVSDB management protocol (RFC7047) monitor mechanism
to get statistics from OVSDB

Synopsis:

<Plugin "ovs_stats">
Port 6640
Address "127.0.0.1"
Socket "/var/run/openvswitch/db.sock"
Bridges "br0" "br_ext"
InterfaceStats false
</Plugin>

The plugin provides the following configuration options:

Port service
TCP-port to connect to. Either a service name or a port number may
be given. Defaults to 6640.

Bridges [brname ...]
List of OVS bridge names to be monitored by this plugin. If this
option is omitted or is empty then all OVS bridges will be
monitored.

Default: empty (monitor all bridges)

InterfaceStats false|true
Indicates that the plugin should gather statistics for individual
interfaces in addition to ports. This can be useful when
monitoring an OVS setup with bond ports, where you might wish to
know individual statistics for the interfaces included in the
bonds. Defaults to false.

Plugin "pcie_errors"
The pcie_errors plugin collects PCI Express errors from Device Status
in Capability structure and from Advanced Error Reporting Extended
Capability where available. At every read it polls config space of PCI
Express devices and dispatches notification for every error that is
set. It checks for new errors at every read. The device is indicated
in plugin_instance according to format "domain:bus:dev.fn". Errors are
divided into categories indicated by type_instance: "correctable", and
for uncorrectable errors "non_fatal" or "fatal". Fatal errors are
reported as NOTIF_FAILURE and all others as NOTIF_WARNING.

Synopsis:

<Plugin "pcie_errors">
Source "sysfs"
AccessDir "/sys/bus/pci"
ReportMasked false
PersistentNotifications false
</Plugin>

Options:

Source sysfs|proc
Use sysfs or proc to read data from /sysfs or /proc. The default
value is sysfs.

AccessDir dir
Directory used to access device config space. It is optional and
defaults to /sys/bus/pci for sysfs and to /proc/bus/pci for proc.

ReportMasked false|true
If true plugin will notify about errors that are set to masked in
Error Mask register. Such errors are not reported to the PCI
Express Root Complex. Defaults to false.

PersistentNotifications false|true
If false plugin will dispatch notification only on set/clear of
error. The ones already reported will be ignored. Defaults to
false.

Plugin "perl"
This plugin embeds a Perl-interpreter into collectd and provides an
interface to collectd's plugin system. See collectd-perl(5) for its
documentation.

Plugin "pinba"
The Pinba plugin receives profiling information from Pinba, an
extension for the PHP interpreter. At the end of executing a script,
i.e. after a PHP-based webpage has been delivered, the extension will
send a UDP packet containing timing information, peak memory usage and
so on. The plugin will wait for such packets, parse them and account
the provided information, which is then dispatched to the daemon once
per interval.

Synopsis:

<Plugin pinba>
Address "::0"
Port "30002"
# Overall statistics for the website.
<View "www-total">
Server "www.example.com"
</View>
# Statistics for www-a only
<View "www-a">
Host "www-a.example.com"
Server "www.example.com"
</View>
# Statistics for www-b only
<View "www-b">
Host "www-b.example.com"
Server "www.example.com"
</View>
</Plugin>

The plugin provides the following configuration options:

Address Node
Configures the address used to open a listening socket. By default,
plugin will bind to the any address "::0".

Port Service
Configures the port (service) to bind to. By default the default
Pinba port "30002" will be used. The option accepts service names
in addition to port numbers and thus requires a string argument.

<View Name> block
The packets sent by the Pinba extension include the hostname of the
server, the server name (the name of the virtual host) and the
script that was executed. Using View blocks it is possible to
separate the data into multiple groups to get more meaningful
statistics. Each packet is added to all matching groups, so that a
packet may be accounted for more than once.

Host Host
Matches the hostname of the system the webserver / script is
running on. This will contain the result of the gethostname(2)
system call. If not configured, all hostnames will be accepted.

Server Server
Matches the name of the virtual host, i.e. the contents of the
$_SERVER["SERVER_NAME"] variable when within PHP. If not
configured, all server names will be accepted.

Script Script
Matches the name of the script name, i.e. the contents of the
$_SERVER["SCRIPT_NAME"] variable when within PHP. If not
configured, all script names will be accepted.

Plugin "ping"
The Ping plugin starts a new thread which sends ICMP "ping" packets to
the configured hosts periodically and measures the network latency.
Whenever the "read" function of the plugin is called, it submits the
average latency, the standard deviation and the drop rate for each
host.

Available configuration options:

Host IP-address
Host to ping periodically. This option may be repeated several
times to ping multiple hosts.

Interval Seconds
Sets the interval in which to send ICMP echo packets to the
configured hosts. This is not the interval in which metrics are
read from the plugin but the interval in which the hosts are
"pinged". Therefore, the setting here should be smaller than or
equal to the global Interval setting. Fractional times, such as
"1.24" are allowed.

Default: 1.0

Timeout Seconds
Time to wait for a response from the host to which an ICMP packet
had been sent. If a reply was not received after Seconds seconds,
the host is assumed to be down or the packet to be dropped. This
setting must be smaller than the Interval setting above for the
plugin to work correctly. Fractional arguments are accepted.

Default: 0.9

TTL 0-255
Sets the Time-To-Live of generated ICMP packets.

Size size
Sets the size of the data payload in ICMP packet to specified size
(it will be filled with regular ASCII pattern). If not set, default
56 byte long string is used so that the packet size of an ICMPv4
packet is exactly 64 bytes, similar to the behaviour of normal
ping(1) command.

SourceAddress host
Sets the source address to use. host may either be a numerical
network address or a network hostname.

AddressFamily af
Sets the address family to use. af may be "any", "ipv4" or "ipv6".
This option will be ignored if you set a SourceAddress.

Device name
Sets the outgoing network device to be used. name has to specify an
interface name (e. g. "eth0"). This might not be supported by all
operating systems.

MaxMissed Packets
Trigger a DNS resolve after the host has not replied to Packets
packets. This enables the use of dynamic DNS services (like
dyndns.org) with the ping plugin.

Default: -1 (disabled)

Plugin "postgresql"
The "postgresql" plugin queries statistics from PostgreSQL databases.
It keeps a persistent connection to all configured databases and tries
to reconnect if the connection has been interrupted. A database is
configured by specifying a Database block as described below. The
default statistics are collected from PostgreSQL's statistics collector
which thus has to be enabled for this plugin to work correctly. This
should usually be the case by default. See the section "The Statistics
Collector" of the PostgreSQL Documentation for details.

By specifying custom database queries using a Query block as described
below, you may collect any data that is available from some PostgreSQL
database. This way, you are able to access statistics of external
daemons which are available in a PostgreSQL database or use future or
special statistics provided by PostgreSQL without the need to upgrade
your collectd installation.

Starting with version 5.2, the "postgresql" plugin supports writing
data to PostgreSQL databases as well. This has been implemented in a
generic way. You need to specify an SQL statement which will then be
executed by collectd in order to write the data (see below for
details). The benefit of that approach is that there is no fixed
database layout. Rather, the layout may be optimized for the current
setup.

The PostgreSQL Documentation manual can be found at
<http://www.postgresql.org/docs/manuals/>.

<Plugin postgresql>
<Query magic>
Statement "SELECT magic FROM wizard WHERE host = $1;"
Param hostname
<Result>
Type gauge
InstancePrefix "magic"
ValuesFrom magic
</Result>
</Query>

<Query rt36_tickets>
Statement "SELECT COUNT(type) AS count, type \
FROM (SELECT CASE \
WHEN resolved = 'epoch' THEN 'open' \
ELSE 'resolved' END AS type \
FROM tickets) type \
GROUP BY type;"
<Result>
Type counter
InstancePrefix "rt36_tickets"
InstancesFrom "type"
ValuesFrom "count"
</Result>
</Query>

<Writer sqlstore>
Statement "SELECT collectd_insert($1, $2, $3, $4, $5, $6, $7, $8, $9);"
StoreRates true
</Writer>

<Database foo>
Plugin "kingdom"
Host "hostname"
Port "5432"
User "username"
Password "secret"
SSLMode "prefer"
KRBSrvName "kerberos_service_name"
Query magic
</Database>

<Database bar>
Interval 300
Service "service_name"
Query backends # predefined
Query rt36_tickets
</Database>

<Database qux>
# ...
Writer sqlstore
CommitInterval 10
</Database>
</Plugin>

The Query block defines one database query which may later be used by a
database definition. It accepts a single mandatory argument which
specifies the name of the query. The names of all queries have to be
unique (see the MinVersion and MaxVersion options below for an
exception to this rule).

In each Query block, there is one or more Result blocks. Multiple
Result blocks may be used to extract multiple values from a single
query.

The following configuration options are available to define the query:

Statement sql query statement
Specify the sql query statement which the plugin should execute.
The string may contain the tokens $1, $2, etc. which are used to
reference the first, second, etc. parameter. The value of the
parameters is specified by the Param configuration option - see
below for details. To include a literal $ character followed by a
number, surround it with single quotes (').

Any SQL command which may return data (such as "SELECT" or "SHOW")
is allowed. Note, however, that only a single command may be used.
Semicolons are allowed as long as a single non-empty command has
been specified only.

The returned lines will be handled separately one after another.

Param hostname|database|instance|username|interval
Specify the parameters which should be passed to the SQL query. The
parameters are referred to in the SQL query as $1, $2, etc. in the
same order as they appear in the configuration file. The value of
the parameter is determined depending on the value of the Param
option as follows:

hostname
The configured hostname of the database connection. If a UNIX
domain socket is used, the parameter expands to "localhost".

database
The name of the database of the current connection.

instance
The name of the database plugin instance. See the Instance
option of the database specification below for details.

username
The username used to connect to the database.

interval
The interval with which this database is queried (as specified
by the database specific or global Interval options).

Please note that parameters are only supported by PostgreSQL's
protocol version 3 and above which was introduced in version 7.4 of
PostgreSQL.

PluginInstanceFrom column
Specify how to create the "PluginInstance" for reporting this query
results. Only one column is supported. You may concatenate fields
and string values in the query statement to get the required
results.

MinVersion version
MaxVersion version
Specify the minimum or maximum version of PostgreSQL that this
query should be used with. Some statistics might only be available
with certain versions of PostgreSQL. This allows you to specify
multiple queries with the same name but which apply to different
versions, thus allowing you to use the same configuration in a
heterogeneous environment.

The version has to be specified as the concatenation of the major,
minor and patch-level versions, each represented as two-decimal-
digit numbers. For example, version 8.2.3 will become 80203.

The Result block defines how to handle the values returned from the
query. It defines which column holds which value and how to dispatch
that value to the daemon.

Type type
The type name to be used when dispatching the values. The type
describes how to handle the data and where to store it. See
types.db(5) for more details on types and their configuration. The
number and type of values (as selected by the ValuesFrom option)
has to match the type of the given name.

This option is mandatory.

InstancePrefix prefix
InstancesFrom column0 [column1 ...]
Specify how to create the "TypeInstance" for each data set (i. e.
line). InstancePrefix defines a static prefix that will be
prepended to all type instances. InstancesFrom defines the column
names whose values will be used to create the type instance.
Multiple values will be joined together using the hyphen ("-") as
separation character.

The plugin itself does not check whether or not all built instances
are different. It is your responsibility to assure that each is
unique.

Both options are optional. If none is specified, the type instance
will be empty.

ValuesFrom column0 [column1 ...]
Names the columns whose content is used as the actual data for the
data sets that are dispatched to the daemon. How many such columns
you need is determined by the Type setting as explained above. If
you specify too many or not enough columns, the plugin will
complain about that and no data will be submitted to the daemon.

The actual data type, as seen by PostgreSQL, is not that important
as long as it represents numbers. The plugin will automatically
cast the values to the right type if it know how to do that. For
that, it uses the strtoll(3) and strtod(3) functions, so anything
supported by those functions is supported by the plugin as well.

This option is required inside a Result block and may be specified
multiple times. If multiple ValuesFrom options are specified, the
columns are read in the given order.

The following predefined queries are available (the definitions can be
found in the postgresql_default.conf file which, by default, is
available at "prefix/share/collectd/"):

backends
This query collects the number of backends, i. e. the number of
connected clients.

transactions
This query collects the numbers of committed and rolled-back
transactions of the user tables.

queries
This query collects the numbers of various table modifications
(i. e. insertions, updates, deletions) of the user tables.

query_plans
This query collects the numbers of various table scans and returned
tuples of the user tables.

table_states
This query collects the numbers of live and dead rows in the user
tables.

disk_io
This query collects disk block access counts for user tables.

disk_usage
This query collects the on-disk size of the database in bytes.

In addition, the following detailed queries are available by default.
Please note that each of those queries collects information by table,
thus, potentially producing a lot of data. For details see the
description of the non-by_table queries above.

queries_by_table
query_plans_by_table
table_states_by_table
disk_io_by_table

The Writer block defines a PostgreSQL writer backend. It accepts a
single mandatory argument specifying the name of the writer. This will
then be used in the Database specification in order to activate the
writer instance. The names of all writers have to be unique. The
following options may be specified:

Statement sql statement
This mandatory option specifies the SQL statement that will be
executed for each submitted value. A single SQL statement is
allowed only. Anything after the first semicolon will be ignored.

Nine parameters will be passed to the statement and should be
specified as tokens $1, $2, through $9 in the statement string. The
following values are made available through those parameters:

$1 The timestamp of the queried value as an RFC 3339-formatted
local time.

$2 The hostname of the queried value.

$3 The plugin name of the queried value.

$4 The plugin instance of the queried value. This value may be
NULL if there is no plugin instance.

$5 The type of the queried value (cf. types.db(5)).

$6 The type instance of the queried value. This value may be NULL
if there is no type instance.

$7 An array of names for the submitted values (i. e., the name of
the data sources of the submitted value-list).

$8 An array of types for the submitted values (i. e., the type of
the data sources of the submitted value-list; "counter",
"gauge", ...). Note, that if StoreRates is enabled (which is
the default, see below), all types will be "gauge".

$9 An array of the submitted values. The dimensions of the value
name and value arrays match.

In general, it is advisable to create and call a custom function in
the PostgreSQL database for this purpose. Any procedural language
supported by PostgreSQL will do (see chapter "Server Programming"
in the PostgreSQL manual for details).

StoreRates false|true
If set to true (the default), convert counter values to rates. If
set to false counter values are stored as is, i. e. as an
increasing integer number.

The Database block defines one PostgreSQL database for which to collect
statistics. It accepts a single mandatory argument which specifies the
database name. None of the other options are required. PostgreSQL will
use default values as documented in the section "CONNECTING TO A
DATABASE" in the psql(1) manpage. However, be aware that those defaults
may be influenced by the user collectd is run as and special
environment variables. See the manpage for details.

Interval seconds
Specify the interval with which the database should be queried. The
default is to use the global Interval setting.

CommitInterval seconds
This option may be used for database connections which have
"writers" assigned (see above). If specified, it causes a writer to
put several updates into a single transaction. This transaction
will last for the specified amount of time. By default, each update
will be executed in a separate transaction. Each transaction
generates a fair amount of overhead which can, thus, be reduced by
activating this option. The draw-back is, that data covering the
specified amount of time will be lost, for example, if a single
statement within the transaction fails or if the database server
crashes.

Plugin Plugin
Use Plugin as the plugin name when submitting query results from
this Database. Defaults to "postgresql".

Instance name
Specify the plugin instance name that should be used instead of the
database name (which is the default, if this option has not been
specified). This allows one to query multiple databases of the same
name on the same host (e.g. when running multiple database server
versions in parallel). The plugin instance name can also be set
from the query result using the PluginInstanceFrom option in Query
block.

Host hostname
Specify the hostname or IP of the PostgreSQL server to connect to.
If the value begins with a slash, it is interpreted as the
directory name in which to look for the UNIX domain socket.

This option is also used to determine the hostname that is
associated with a collected data set. If it has been omitted or
either begins with with a slash or equals localhost it will be
replaced with the global hostname definition of collectd. Any other
value will be passed literally to collectd when dispatching values.
Also see the global Hostname and FQDNLookup options.

Port port
Specify the TCP port or the local UNIX domain socket file extension
of the server.

User username
Specify the username to be used when connecting to the server.

Password password
Specify the password to be used when connecting to the server.

ExpireDelay delay
Skip expired values in query output.

SSLMode disable|allow|prefer|require
Specify whether to use an SSL connection when contacting the
server. The following modes are supported:

disable
Do not use SSL at all.

allow
First, try to connect without using SSL. If that fails, try
using SSL.

prefer (default)
First, try to connect using SSL. If that fails, try without
using SSL.

require
Use SSL only.

KRBSrvName kerberos_service_name
Specify the Kerberos service name to use when authenticating with
Kerberos 5 or GSSAPI. See the sections "Kerberos authentication"
and "GSSAPI" of the PostgreSQL Documentation for details.

Service service_name
Specify the PostgreSQL service name to use for additional
parameters. That service has to be defined in pg_service.conf and
holds additional connection parameters. See the section "The
Connection Service File" in the PostgreSQL Documentation for
details.

Query query
Specifies a query which should be executed in the context of the
database connection. This may be any of the predefined or user-
defined queries. If no such option is given, it defaults to
"backends", "transactions", "queries", "query_plans",
"table_states", "disk_io" and "disk_usage" (unless a Writer has
been specified). Else, the specified queries are used only.

Writer writer
Assigns the specified writer backend to the database connection.
This causes all collected data to be send to the database using the
settings defined in the writer configuration (see the section
"FILTER CONFIGURATION" below for details on how to selectively send
data to certain plugins).

Each writer will register a flush callback which may be used when
having long transactions enabled (see the CommitInterval option
above). When issuing the FLUSH command (see collectd-unixsock(5)
for details) the current transaction will be committed right away.
Two different kinds of flush callbacks are available with the
"postgresql" plugin:

postgresql
Flush all writer backends.

postgresql-database
Flush all writers of the specified database only.

Plugin "powerdns"
The "powerdns" plugin queries statistics from an authoritative PowerDNS
nameserver and/or a PowerDNS recursor. Since both offer a wide variety
of values, many of which are probably meaningless to most users, but
may be useful for some. So you may chose which values to collect, but
if you don't, some reasonable defaults will be collected.

<Plugin "powerdns">
<Server "server_name">
Collect "latency"
Collect "udp-answers" "udp-queries"
Socket "/var/run/pdns.controlsocket"
</Server>
<Recursor "recursor_name">
Collect "questions"
Collect "cache-hits" "cache-misses"
Socket "/var/run/pdns_recursor.controlsocket"
</Recursor>
LocalSocket "/opt/collectd/var/run/collectd-powerdns"
</Plugin>

Server and Recursor block
The Server block defines one authoritative server to query, the
Recursor does the same for an recursing server. The possible
options in both blocks are the same, though. The argument defines a
name for the server / recursor and is required.

Collect Field
Using the Collect statement you can select which values to
collect. Here, you specify the name of the values as used by
the PowerDNS servers, e. g. "dlg-only-drops", "answers10-100".

The method of getting the values differs for Server and
Recursor blocks: When querying the server a "SHOW *" command is
issued in any case, because that's the only way of getting
multiple values out of the server at once. collectd then picks
out the values you have selected. When querying the recursor, a
command is generated to query exactly these values. So if you
specify invalid fields when querying the recursor, a syntax
error may be returned by the daemon and collectd may not
collect any values at all.

If no Collect statement is given, the following Server values
will be collected:

latency
packetcache-hit
packetcache-miss
packetcache-size
query-cache-hit
query-cache-miss
recursing-answers
recursing-questions
tcp-answers
tcp-queries
udp-answers
udp-queries

The following Recursor values will be collected by default:

noerror-answers
nxdomain-answers
servfail-answers
sys-msec
user-msec
qa-latency
cache-entries
cache-hits
cache-misses
questions

Please note that up to that point collectd doesn't know what
values are available on the server and values that are added do
not need a change of the mechanism so far. However, the values
must be mapped to collectd's naming scheme, which is done using
a lookup table that lists all known values. If values are added
in the future and collectd does not know about them, you will
get an error much like this:

powerdns plugin: submit: Not found in lookup table: foobar = 42

In this case please file a bug report with the collectd team.

Socket Path
Configures the path to the UNIX domain socket to be used when
connecting to the daemon. By default
"${localstatedir}/run/pdns.controlsocket" will be used for an
authoritative server and
"${localstatedir}/run/pdns_recursor.controlsocket" will be used
for the recursor.

LocalSocket Path
Querying the recursor is done using UDP. When using UDP over UNIX
domain sockets, the client socket needs a name in the file system,
too. You can set this local name to Path using the LocalSocket
option. The default is "prefix/var/run/collectd-powerdns".

Plugin "processes"
Collects information about processes of local system.

By default, with no process matches configured, only general statistics
is collected: the number of processes in each state and fork rate.

Process matches can be configured by Process and ProcessMatch options.
These may also be a block in which further options may be specified.

The statistics collected for matched processes are:
- size of the resident segment size (RSS)
- user- and system-time used
- number of processes
- number of threads
- number of open files (under Linux)
- number of memory mapped files (under Linux)
- io data (where available)
- context switches (under Linux)
- minor and major pagefaults
- Delay Accounting information (Linux only, requires libmnl)

Synopsis:

<Plugin processes>
CollectFileDescriptor true
CollectContextSwitch true
CollectDelayAccounting false
Process "name"
ProcessMatch "name" "regex"
<Process "collectd">
CollectFileDescriptor false
CollectContextSwitch false
CollectDelayAccounting true
</Process>
<ProcessMatch "name" "regex">
CollectFileDescriptor false
CollectContextSwitch true
</ProcessMatch>
</Plugin>

Process Name
Select more detailed statistics of processes matching this name.

Some platforms have a limit on the length of process names. Name
must stay below this limit.

ProcessMatch name regex
Select more detailed statistics of processes matching the specified
regex (see regex(7) for details). The statistics of all matching
processes are summed up and dispatched to the daemon using the
specified name as an identifier. This allows one to "group" several
processes together. name must not contain slashes.

CollectContextSwitch Boolean
Collect the number of context switches for matched processes.
Disabled by default.

CollectDelayAccounting Boolean
If enabled, collect Linux Delay Accounding information for matching
processes. Delay Accounting provides the time processes wait for
the CPU to become available, for I/O operations to finish, for
pages to be swapped in and for freed pages to be reclaimed. The
metrics are reported as "seconds per second" using the "delay_rate"
type, e.g. "delay_rate-delay-cpu". Disabled by default.

This option is only available on Linux, requires the "libmnl"
library and requires the "CAP_NET_ADMIN" capability at runtime.

CollectFileDescriptor Boolean
Collect number of file descriptors of matched processes. Disabled
by default.

CollectMemoryMaps Boolean
Collect the number of memory mapped files of the process. The
limit for this number is configured via /proc/sys/vm/max_map_count
in the Linux kernel.

The CollectContextSwitch, CollectDelayAccounting, CollectFileDescriptor
and CollectMemoryMaps options may be used inside Process and
ProcessMatch blocks. When used there, these options affect reporting
the corresponding processes only. Outside of Process and ProcessMatch
blocks these options set the default value for subsequent matches.

Plugin "procevent"
The procevent plugin monitors when processes start (EXEC) and stop
(EXIT).

Synopsis:

<Plugin procevent>
BufferLength 10
Process "name"
ProcessRegex "regex"
</Plugin>

Options:

BufferLength length
Maximum number of process events that can be stored in plugin's
ring buffer. By default, this is set to 10. Once an event has
been read, its location becomes available for storing a new event.

Process name
Enumerate a process name to monitor. All processes that match this
exact name will be monitored for EXECs and EXITs.

ProcessRegex regex
Enumerate a process pattern to monitor. All processes that match
this regular expression will be monitored for EXECs and EXITs.

Plugin "protocols"
Collects a lot of information about various network protocols, such as
IP, TCP, UDP, etc.

Available configuration options:

Value Selector
Selects whether or not to select a specific value. The string being
matched is of the form "Protocol:ValueName", where Protocol will be
used as the plugin instance and ValueName will be used as type
instance. An example of the string being used would be
"Tcp:RetransSegs".

You can use regular expressions to match a large number of values
with just one configuration option. To select all "extended" TCP
values, you could use the following statement:

Value "/^TcpExt:/"

Whether only matched values are selected or all matched values are
ignored depends on the IgnoreSelected. By default, only matched
values are selected. If no value is configured at all, all values
will be selected.

See /"IGNORELISTS" for details.

IgnoreSelected true|false
If set to true, inverts the selection made by Value, i. e. all
matching values will be ignored.

Plugin "python"
This plugin embeds a Python-interpreter into collectd and provides an
interface to collectd's plugin system. See collectd-python(5) for its
documentation.

Plugin "redfish"
The "redfish" plugin collects sensor data using REST protocol called
Redfish.

Sample configuration:

<Plugin redfish>
<Query "fans">
Endpoint "/redfish/v1/Chassis/Chassis-1/Thermal"
<Resource "Fans">
<Property "ReadingRPM">
PluginInstance "chassis-1"
Type "rpm"
</Property>
</Resource>
</Query>
<Query "temperatures">
Endpoint "/redfish/v1/Chassis/Chassis-1/Thermal"
<Resource "Temperatures">
<Property "ReadingCelsius">
PluginInstance "chassis-1"
Type "degrees"
</Property>
</Resource>
</Query>
<Query "voltages">
Endpoint "/redfish/v1/Chassis/Chassis-1/Power"
<Resource "Voltages">
<Property "ReadingVolts">
PluginInstance "chassis-1"
Type "volts"
</Property>
</Resource>
</Query>
<Service "local">
Host "127.0.0.1:5000"
User "user"
Passwd "passwd"
Queries "fans" "voltages" "temperatures"
</Service>
</Plugin>

Query
Section defining a query performed on Redfish interface

Endpoint
URI of the REST API Endpoint for accessing the BMC

Resource
Selects single resource or array to collect data.

Property
Selects property from which data is gathered

PluginInstance
Plugin instance of dispatched collectd metric

Type
Type of dispatched collectd metric

TypeInstance
Type instance of collectd metric

Service
Section defining service to be sent requests

Username
BMC username

Password
BMC password

Queries
Queries to run

Plugin "routeros"
The "routeros" plugin connects to a device running RouterOS, the Linux-
based operating system for routers by MikroTik. The plugin uses
librouteros to connect and reads information about the interfaces and
wireless connections of the device. The configuration supports querying
multiple routers:

<Plugin "routeros">
<Router>
Host "router0.example.com"
User "collectd"
Password "secr3t"
CollectInterface true
CollectCPULoad true
CollectMemory true
</Router>
<Router>
Host "router1.example.com"
User "collectd"
Password "5ecret"
CollectInterface true
CollectRegistrationTable true
CollectDF true
CollectDisk true
CollectHealth true
</Router>
</Plugin>

As you can see above, the configuration of the routeros plugin consists
of one or more <Router> blocks. Within each block, the following
options are understood:

Host Host
Hostname or IP-address of the router to connect to.

Port Port
Port name or port number used when connecting. If left unspecified,
the default will be chosen by librouteros, currently "8728". This
option expects a string argument, even when a numeric port number
is given.

User User
Use the user name User to authenticate. Defaults to "admin".

Password Password
Set the password used to authenticate.

CollectInterface true|false
When set to true, interface statistics will be collected for all
interfaces present on the device. Defaults to false.

CollectRegistrationTable true|false
When set to true, information about wireless LAN connections will
be collected. Defaults to false.

CollectCPULoad true|false
When set to true, information about the CPU usage will be
collected. The number is a dimensionless value where zero indicates
no CPU usage at all. Defaults to false.

CollectMemory true|false
When enabled, the amount of used and free memory will be collected.
How used memory is calculated is unknown, for example whether or
not caches are counted as used space. Defaults to false.

CollectDF true|false
When enabled, the amount of used and free disk space will be
collected. Defaults to false.

CollectDisk true|false
When enabled, the number of sectors written and bad blocks will be
collected. Defaults to false.

CollectHealth true|false
When enabled, the health statistics will be collected. This
includes the voltage and temperature on supported hardware.
Defaults to false.

Plugin "redis"
The Redis plugin connects to one or more Redis servers, gathers
information about each server's state and executes user-defined
queries. For each server there is a Node block which configures the
connection parameters and set of user-defined queries for this node.

<Plugin redis>
<Node "example">
Host "localhost"
Port "6379"
#Socket "/var/run/redis/redis.sock"
Timeout 2000
ReportCommandStats false
ReportCpuUsage true
<Query "LLEN myqueue">
#Database 0
Type "queue_length"
Instance "myqueue"
</Query>
</Node>
</Plugin>

Node Nodename
The Node block identifies a new Redis node, that is a new Redis
instance running in an specified host and port. The name for node
is a canonical identifier which is used as plugin instance. It is
limited to 128 characters in length.

When no Node is configured explicitly, plugin connects to
"localhost:6379".

Host Hostname
The Host option is the hostname or IP-address where the Redis
instance is running on.

Port Port
The Port option is the TCP port on which the Redis instance accepts
connections. Either a service name of a port number may be given.
Please note that numerical port numbers must be given as a string,
too.

Socket Path
Connect to Redis using the UNIX domain socket at Path. If this
setting is given, the Hostname and Port settings are ignored.

Password Password
Use Password to authenticate when connecting to Redis.

Timeout Milliseconds
The Timeout option set the socket timeout for node response. Since
the Redis read function is blocking, you should keep this value as
low as possible. It is expected what Timeout values should be
lower than Interval defined globally.

Defaults to 2000 (2 seconds).

ReportCommandStats false|true
Enables or disables reporting of statistics based on the command
type, including rate of command calls and average CPU time consumed
by command processing. Defaults to false.

ReportCpuUsage true|false
Enables or disables reporting of CPU consumption statistics.
Defaults to true.

Query Querystring
The Query block identifies a query to execute against the redis
server. There may be an arbitrary number of queries to execute.
Each query should return single string or integer.

Type Collectd type
Within a query definition, a valid collectd type to use as when
submitting the result of the query. When not supplied, will default
to gauge.

Currently only types with one datasource are supported. See
types.db(5) for more details on types and their configuration.

Instance Type instance
Within a query definition, an optional type instance to use when
submitting the result of the query. When not supplied will default
to the escaped command, up to 128 chars.

Database Index
This index selects the Redis logical database to use for query.
Defaults to 0.

Plugin "rrdcached"
The "rrdcached" plugin uses the RRDtool accelerator daemon,
rrdcached(1), to store values to RRD files in an efficient manner. The
combination of the "rrdcached" plugin and the "rrdcached" daemon is
very similar to the way the "rrdtool" plugin works (see below). The
added abstraction layer provides a number of benefits, though: Because
the cache is not within "collectd" anymore, it does not need to be
flushed when "collectd" is to be restarted. This results in much
shorter (if any) gaps in graphs, especially under heavy load. Also, the
"rrdtool" command line utility is aware of the daemon so that it can
flush values to disk automatically when needed. This allows one to
integrate automated flushing of values into graphing solutions much
more easily.

There are disadvantages, though: The daemon may reside on a different
host, so it may not be possible for "collectd" to create the
appropriate RRD files anymore. And even if "rrdcached" runs on the same
host, it may run in a different base directory, so relative paths may
do weird stuff if you're not careful.

So the recommended configuration is to let "collectd" and "rrdcached"
run on the same host, communicating via a UNIX domain socket. The
DataDir setting should be set to an absolute path, so that a changed
base directory does not result in RRD files being created / expected in
the wrong place.

DaemonAddress Address
Address of the daemon as understood by the "rrdc_connect" function
of the RRD library. See rrdcached(1) for details. Example:

<Plugin "rrdcached">
DaemonAddress "unix:/var/run/rrdcached.sock"
</Plugin>

DataDir Directory
Set the base directory in which the RRD files reside. If this is a
relative path, it is relative to the working base directory of the
"rrdcached" daemon! Use of an absolute path is recommended.

CreateFiles true|false
Enables or disables the creation of RRD files. If the daemon is not
running locally, or DataDir is set to a relative path, this will
not work as expected. Default is true.

CreateFilesAsync false|true
When enabled, new RRD files are enabled asynchronously, using a
separate thread that runs in the background. This prevents writes
to block, which is a problem especially when many hundreds of files
need to be created at once. However, since the purpose of creating
the files asynchronously is not to block until the file is
available, values before the file is available will be discarded.
When disabled (the default) files are created synchronously,
blocking for a short while, while the file is being written.

StepSize Seconds
Force the stepsize of newly created RRD-files. Ideally (and per
default) this setting is unset and the stepsize is set to the
interval in which the data is collected. Do not use this option
unless you absolutely have to for some reason. Setting this option
may cause problems with the "snmp plugin", the "exec plugin" or
when the daemon is set up to receive data from other hosts.

HeartBeat Seconds
Force the heartbeat of newly created RRD-files. This setting should
be unset in which case the heartbeat is set to twice the StepSize
which should equal the interval in which data is collected. Do not
set this option unless you have a very good reason to do so.

RRARows NumRows
The "rrdtool plugin" calculates the number of PDPs per CDP based on
the StepSize, this setting and a timespan. This plugin creates RRD-
files with three times five RRAs, i. e. five RRAs with the CFs MIN,
AVERAGE, and MAX. The five RRAs are optimized for graphs covering
one hour, one day, one week, one month, and one year.

So for each timespan, it calculates how many PDPs need to be
consolidated into one CDP by calculating:
number of PDPs = timespan / (stepsize * rrarows)

Bottom line is, set this no smaller than the width of you graphs in
pixels. The default is 1200.

RRATimespan Seconds
Adds an RRA-timespan, given in seconds. Use this option multiple
times to have more then one RRA. If this option is never used, the
built-in default of (3600, 86400, 604800, 2678400, 31622400) is
used.

For more information on how RRA-sizes are calculated see RRARows
above.

XFF Factor
Set the "XFiles Factor". The default is 0.1. If unsure, don't set
this option. Factor must be in the range "[0.0-1.0)", i.e. between
zero (inclusive) and one (exclusive).

CollectStatistics false|true
When set to true, various statistics about the rrdcached daemon
will be collected, with "rrdcached" as the plugin name. Defaults to
false.

Statistics are read via rrdcacheds socket using the STATS command.
See rrdcached(1) for details.

Plugin "rrdtool"
You can use the settings StepSize, HeartBeat, RRARows, and XFF to fine-
tune your RRD-files. Please read rrdcreate(1) if you encounter problems
using these settings. If you don't want to dive into the depths of
RRDtool, you can safely ignore these settings.

DataDir Directory
Set the directory to store RRD files under. By default RRD files
are generated beneath the daemon's working directory, i.e. the
BaseDir.

RRARows NumRows
The "rrdtool plugin" calculates the number of PDPs per CDP based on
the StepSize, this setting and a timespan. This plugin creates RRD-
files with three times five RRAs, i.e. five RRAs with the CFs MIN,
AVERAGE, and MAX. The five RRAs are optimized for graphs covering
one hour, one day, one week, one month, and one year.

So for each timespan, it calculates how many PDPs need to be
consolidated into one CDP by calculating:
number of PDPs = timespan / (stepsize * rrarows)

Bottom line is, set this no smaller than the width of you graphs in
pixels. The default is 1200.

For more information on how RRA-sizes are calculated see RRARows
above.

XFF Factor
Set the "XFiles Factor". The default is 0.1. If unsure, don't set
this option. Factor must be in the range "[0.0-1.0)", i.e. between
zero (inclusive) and one (exclusive).

CacheFlush Seconds
When the "rrdtool" plugin uses a cache (by setting CacheTimeout,
see below) it writes all values for a certain RRD-file if the
oldest value is older than (or equal to) the number of seconds
specified by CacheTimeout. That check happens on new values
arriwal. If some RRD-file is not updated anymore for some reason
(the computer was shut down, the network is broken, etc.) some
values may still be in the cache. If CacheFlush is set, then every
Seconds seconds the entire cache is searched for entries older than
CacheTimeout + RandomTimeout seconds. The entries found are written
to disk. Since scanning the entire cache is kind of expensive and
does nothing under normal circumstances, this value should not be
too small. 900 seconds might be a good value, though setting this
to 7200 seconds doesn't normally do much harm either.

Defaults to 10x CacheTimeout. CacheFlush must be larger than or
equal to CacheTimeout, otherwise the above default is used.

CacheTimeout Seconds
If this option is set to a value greater than zero, the "rrdtool
plugin" will save values in a cache, as described above. Writing
multiple values at once reduces IO-operations and thus lessens the
load produced by updating the files. The trade off is that the
graphs kind of "drag behind" and that more memory is used.

WritesPerSecond Updates
When collecting many statistics with collectd and the "rrdtool"
plugin, you will run serious performance problems. The CacheFlush
setting and the internal update queue assert that collectd
continues to work just fine even under heavy load, but the system
may become very unresponsive and slow. This is a problem especially
if you create graphs from the RRD files on the same machine, for
example using the "graph.cgi" script included in the
"contrib/collection3/" directory.

This setting is designed for very large setups. Setting this option
to a value between 25 and 80 updates per second, depending on your
hardware, will leave the server responsive enough to draw graphs
even while all the cached values are written to disk. Flushed
values, i. e. values that are forced to disk by the FLUSH command,
are not effected by this limit. They are still written as fast as
possible, so that web frontends have up to date data when
generating graphs.

For example: If you have 100,000 RRD files and set WritesPerSecond
to 30 updates per second, writing all values to disk will take
approximately 56 minutes. Together with the flushing ability that's
integrated into "collection3" you'll end up with a responsive and
fast system, up to date graphs and basically a "backup" of your
values every hour.

RandomTimeout Seconds
When set, the actual timeout for each value is chosen randomly
between CacheTimeout-RandomTimeout and CacheTimeout+RandomTimeout.
The intention is to avoid high load situations that appear when
many values timeout at the same time. This is especially a problem
shortly after the daemon starts, because all values were added to
the internal cache at roughly the same time.

Plugin "sensors"
The Sensors plugin uses lm_sensors to retrieve sensor-values. This
means that all the needed modules have to be loaded and lm_sensors has
to be configured (most likely by editing /etc/sensors.conf. Read
sensors.conf(5) for details.

The lm_sensors homepage can be found at
<http://secure.netroedge.com/~lm78/>.

SensorConfigFile File
Read the lm_sensors configuration from File. When unset
(recommended), the library's default will be used.

Sensor chip-bus-address/type-feature
Selects the name of the sensor which you want to collect or ignore,
depending on the IgnoreSelected below. For example, the option
"Sensor it8712-isa-0290/voltage-in1" will cause collectd to gather
data for the voltage sensor in1 of the it8712 on the isa bus at the
address 0290.

The value passed to this option has the format
"plugin_instance/type-type_instance".

See /"IGNORELISTS" for details.

IgnoreSelected true|false
If no configuration if given, the sensors-plugin will collect data
from all sensors. This may not be practical, especially for
uninteresting sensors. Thus, you can use the Sensor-option to pick
the sensors you're interested in. Sometimes, however, it's
easier/preferred to collect all sensors except a few ones. This
option enables you to do that: By setting IgnoreSelected to true
the effect of Sensor is inverted: All selected sensors are ignored
and all other sensors are collected.

UseLabels true|false
Configures how sensor readings are reported. When set to true,
sensor readings are reported using their descriptive label (e.g.
"VCore"). When set to false (the default) the sensor name is used
("in0").

Plugin "sigrok"
The sigrok plugin uses libsigrok to retrieve measurements from any
device supported by the sigrok <http://sigrok.org/> project.

Synopsis

<Plugin sigrok>
LogLevel 3
<Device "AC Voltage">
Driver "fluke-dmm"
MinimumInterval 10
Conn "/dev/ttyUSB2"
</Device>
<Device "Sound Level">
Driver "cem-dt-885x"
Conn "/dev/ttyUSB1"
</Device>
</Plugin>

LogLevel 0-5
The sigrok logging level to pass on to the collectd log, as a
number between 0 and 5 (inclusive). These levels correspond to
"None", "Errors", "Warnings", "Informational", "Debug "and "Spew",
respectively. The default is 2 ("Warnings"). The sigrok log
messages, regardless of their level, are always submitted to
collectd at its INFO log level.

<Device Name>
A sigrok-supported device, uniquely identified by this section's
options. The Name is passed to collectd as the plugin instance.

Driver DriverName
The sigrok driver to use for this device.

Conn ConnectionSpec
If the device cannot be auto-discovered, or more than one might be
discovered by the driver, ConnectionSpec specifies the connection
string to the device. It can be of the form of a device path
(e.g. "/dev/ttyUSB2"), or, in case of a non-serial USB-connected
device, the USB VendorID.ProductID separated by a period
(e.g. 0403.6001). A USB device can also be specified as Bus.Address
(e.g. 1.41).

SerialComm SerialSpec
For serial devices with non-standard port settings, this option can
be used to specify them in a form understood by sigrok,
e.g. "9600/8n1". This should not be necessary; drivers know how to
communicate with devices they support.

MinimumInterval Seconds
Specifies the minimum time between measurement dispatches to
collectd, in seconds. Since some sigrok supported devices can
acquire measurements many times per second, it may be necessary to
throttle these. For example, the RRD plugin cannot process writes
more than once per second.

The default MinimumInterval is 0, meaning measurements received
from the device are always dispatched to collectd. When throttled,
unused measurements are discarded.

Plugin "slurm"
This plugin collects per-partition SLURM node and job state
information, as well as internal health statistics. It takes no
options. It should run on a node that is capable of running the sinfo
and squeue commands, i.e. it has a running slurmd and a valid
slurm.conf. Note that this plugin needs the Globals option set to true
in order to function properly.

Plugin "smart"
The "smart" plugin collects SMART information from physical disks.
Values collectd include temperature, power cycle count, poweron time
and bad sectors. Also, all SMART attributes are collected along with
the normalized current value, the worst value, the threshold and a
human readable value. The plugin can also collect SMART attributes for
NVMe disks (present in accordance with NVMe 1.4 spec) and Additional
SMART Attributes from IntelX NVMe disks.

Using the following two options you can ignore some disks or configure
the collection only of specific disks.

Disk "sdd"
Disk "/hda[34]/"
Disk "nvme0n1"

See /"IGNORELISTS" for details.

IgnoreSleepMode true|false
Normally, the "smart" plugin will ignore disks that are reported to
be asleep. This option disables the sleep mode check and allows
the plugin to collect data from these disks anyway. This is useful
in cases where libatasmart mistakenly reports disks as asleep
because it has not been updated to incorporate support for newer
idle states in the ATA spec.

UseSerial true|false
A disk's kernel name (e.g., sda) can change from one boot to the
next. If this option is enabled, the "smart" plugin will use the
disk's serial number (e.g., HGST_HUH728080ALE600_2EJ8VH8X) instead
of the kernel name as the key for storing data. This ensures that
the data for a given disk will be kept together even if the kernel
name changes.

Plugin "snmp"
Since the configuration of the "snmp plugin" is a little more
complicated than other plugins, its documentation has been moved to an
own manpage, collectd-snmp(5). Please see there for details.

Plugin "snmp_agent"
The snmp_agent plugin is an AgentX subagent that receives and handles
queries from SNMP master agent and returns the data collected by read
plugins. The snmp_agent plugin handles requests only for OIDs
specified in configuration file. To handle SNMP queries the plugin gets
data from collectd and translates requested values from collectd's
internal format to SNMP format. This plugin is a generic plugin and
cannot work without configuration. For more details on AgentX subagent
see <http://www.net-snmp.org/tutorial/tutorial-5/toolkit/demon/>

Synopsis:

<Plugin snmp_agent>
<Data "memAvailReal">
Plugin "memory"
#PluginInstance "some"
Type "memory"
TypeInstance "free"
OIDs "1.3.6.1.4.1.2021.4.6.0"
</Data>
<Table "ifTable">
IndexOID "IF-MIB::ifIndex"
SizeOID "IF-MIB::ifNumber"
<Data "ifDescr">
<IndexKey>
Source "PluginInstance"
</IndexKey>
Plugin "interface"
OIDs "IF-MIB::ifDescr"
</Data>
<Data "ifOctets">
Plugin "interface"
Type "if_octets"
TypeInstance ""
OIDs "IF-MIB::ifInOctets" "IF-MIB::ifOutOctets"
</Data>
</Table>
<Table "CPUAffinityTable">
<Data "DomainName">
<IndexKey>
Source "PluginInstance"
</IndexKey>
Plugin "virt"
OIDs "LIBVIRT-HYPERVISOR-MIB::lvhAffinityDomainName"
</Data>
<Data "VCPU">
Plugin "virt"
<IndexKey>
Source "TypeInstance"
Regex "^vcpu_([0-9]{1,3})-cpu_[0-9]{1,3}$"
Group 1
</IndexKey>
OIDs "LIBVIRT-HYPERVISOR-MIB::lvhVCPUIndex"
</Data>
<Data "CPU">
Plugin "virt"
<IndexKey>
Source "TypeInstance"
Regex "^vcpu_[0-9]{1,3}-cpu_([0-9]{1,3})$"
Group 1
</IndexKey>
OIDs "LIBVIRT-HYPERVISOR-MIB::lvhCPUIndex"
</Data>
<Data "CPUAffinity">
Plugin "virt"
Type "cpu_affinity"
OIDs "LIBVIRT-HYPERVISOR-MIB::lvhCPUAffinity"
</Data>
</Table>
</Plugin>

There are two types of blocks that can be contained in the "<Plugin
snmp_agent>" block: Data and Table:

Data block

The Data block defines a list OIDs that are to be handled. This block
can define scalar or table OIDs. If Data block is defined inside of
Table block it reperesents table OIDs. The following options can be
set:

IndexKey block
IndexKey block contains all data needed for proper index build of
snmp table. In case more than one table Data block has IndexKey
block present then multiple key index is built. If Data block
defines scalar data type IndexKey has no effect and can be omitted.

Source String
Source can be set to one of the following values:
"Hostname", "Plugin", "PluginInstance", "Type",
"TypeInstance". This value indicates which field of
corresponding collectd metric is taken as a SNMP table
index.

Regex String
Regex option can also be used to parse strings or numbers
out of specific field. For example: type-instance field
which is "vcpu1-cpu2" can be parsed into two numeric fields
CPU = 2 and VCPU = 1 and can be later used as a table
index.

Group Number
Group number can be specified in case groups are used in
regex.

Plugin String
Read plugin name whose collected data will be mapped to specified
OIDs.

PluginInstance String
Read plugin instance whose collected data will be mapped to
specified OIDs. The field is optional and by default there is no
plugin instance check. Allowed only if Data block defines scalar
data type.

Type String
Collectd's type that is to be used for specified OID, e. g.
"if_octets" for example. The types are read from the TypesDB (see
collectd.conf(5)).

TypeInstance String
Collectd's type-instance that is to be used for specified OID.

OIDs OID [OID ...]
Configures the OIDs to be handled by snmp_agent plugin. Values for
these OIDs are taken from collectd data type specified by Plugin,
PluginInstance, Type, TypeInstance fields of this Data block.
Number of the OIDs configured should correspond to number of values
in specified Type. For example two OIDs "IF-MIB::ifInOctets"
"IF-MIB::ifOutOctets" can be mapped to "rx" and "tx" values of
"if_octets" type.

Scale Value
The values taken from collectd are multiplied by Value. The field
is optional and the default is 1.0.

Shift Value
Value is added to values from collectd after they have been
multiplied by Scale value. The field is optional and the default
value is 0.0.

The Table block

The Table block defines a collection of Data blocks that belong to one
snmp table. In addition to multiple Data blocks the following options
can be set:

IndexOID OID
OID that is handled by the plugin and is mapped to numerical index
value that is generated by the plugin for each table record.

SizeOID OID
OID that is handled by the plugin. Returned value is the number of
records in the table. The field is optional.

Plugin "statsd"
The statsd plugin listens to a UDP socket, reads "events" in the statsd
protocol and dispatches rates or other aggregates of these numbers
periodically.

The plugin implements the Counter, Timer, Gauge and Set types which are
dispatched as the collectd types "derive", "latency", "gauge" and
"objects" respectively.

The following configuration options are valid:

Host Host
Bind to the hostname / address Host. By default, the plugin will
bind to the "any" address, i.e. accept packets sent to any of the
hosts addresses.

Port Port
UDP port to listen to. This can be either a service name or a port
number. Defaults to 8125.

DeleteCounters false|true
DeleteTimers false|true
DeleteGauges false|true
DeleteSets false|true
These options control what happens if metrics are not updated in an
interval. If set to False, the default, metrics are dispatched
unchanged, i.e. the rate of counters and size of sets will be zero,
timers report "NaN" and gauges are unchanged. If set to True, the
such metrics are not dispatched and removed from the internal
cache.

CounterSum false|true
When enabled, creates a "count" metric which reports the change
since the last read. This option primarily exists for compatibility
with the statsd implementation by Etsy.

TimerPercentile Percent
Calculate and dispatch the configured percentile, i.e. compute the
latency, so that Percent of all reported timers are smaller than or
equal to the computed latency. This is useful for cutting off the
long tail latency, as it's often done in Service Level Agreements
(SLAs).

Different percentiles can be calculated by setting this option
several times. If none are specified, no percentiles are
calculated / dispatched.

TimerLower false|true
TimerUpper false|true
TimerSum false|true
TimerCount false|true
Calculate and dispatch various values out of Timer metrics received
during an interval. If set to False, the default, these values
aren't calculated / dispatched.

Please note what reported timer values less than 0.001 are ignored
in all Timer* reports.

Plugin "swap"
The Swap plugin collects information about used and available swap
space. On Linux and Solaris, the following options are available:

ReportByDevice false|true
Configures how to report physical swap devices. If set to false
(the default), the summary over all swap devices is reported only,
i.e. the globally used and available space over all devices. If
true is configured, the used and available space of each device
will be reported separately.

This option is only available if the Swap plugin can read
"/proc/swaps" (under Linux) or use the swapctl(2) mechanism (under
Solaris).

ReportBytes false|true
When enabled, the swap I/O is reported in bytes. When disabled, the
default, swap I/O is reported in pages. This option is available
under Linux only.

ValuesAbsolute true|false
Enables or disables reporting of absolute swap metrics, i.e. number
of bytes available and used. Defaults to true.

ValuesPercentage false|true
Enables or disables reporting of relative swap metrics, i.e.
percent available and free. Defaults to false.

This is useful for deploying collectd in a heterogeneous
environment, where swap sizes differ and you want to specify
generic thresholds or similar.

ReportIO true|false
Enables or disables reporting swap IO. Defaults to true.

This is useful for the cases when swap IO is not neccessary, is not
available, or is not reliable.

Plugin "sysevent"
The sysevent plugin monitors rsyslog messages.

Synopsis:

<Plugin sysevent>
Listen "192.168.0.2" "6666"
BufferSize 1024
BufferLength 10
RegexFilter "regex"
</Plugin>

rsyslog should be configured such that it sends data to the IP and port you
include in the plugin configuration. For example, given the configuration
above, something like this would be set in /etc/rsyslog.conf:

if $programname != 'collectd' then
*.* @192.168.0.2:6666

This plugin is designed to consume JSON rsyslog data, so a more complete
rsyslog configuration would look like so (where we define a JSON template
and use it when sending data to our IP and port):

$template ls_json,"{%timestamp:::date-rfc3339,jsonf:@timestamp%, \
%source:::jsonf:@source_host%,\"@source\":\"syslog://%fromhost-ip:::json%\", \
\"@message\":\"%timestamp% %app-name%:%msg:::json%\",\"@fields\": \
{%syslogfacility-text:::jsonf:facility%,%syslogseverity:::jsonf:severity-num%, \
%syslogseverity-text:::jsonf:severity%,%programname:::jsonf:program%, \
%procid:::jsonf:processid%}}"

if $programname != 'collectd' then
*.* @192.168.0.2:6666;ls_json

Please note that these rsyslog.conf examples are *not* complete, as rsyslog
requires more than these options in the configuration file. These examples
are meant to demonstration the proper remote logging and JSON format syntax.

Options:

Listen host port
Listen on this IP on this port for incoming rsyslog messages.

BufferSize length
Maximum allowed size for incoming rsyslog messages. Messages that
exceed this number will be truncated to this size. Default is 4096
bytes.

BufferLength length
Maximum number of rsyslog events that can be stored in plugin's
ring buffer. By default, this is set to 10. Once an event has
been read, its location becomes available for storing a new event.

RegexFilter regex
Enumerate a regex filter to apply to all incoming rsyslog messages.
If a message matches this filter, it will be published.

Plugin "syslog"
LogLevel debug|info|notice|warning|err
Sets the log-level. If, for example, set to notice, then all events
with severity notice, warning, or err will be submitted to the
syslog-daemon.

Please note that debug is only available if collectd has been
compiled with debugging support.

NotifyLevel OKAY|WARNING|FAILURE
Controls which notifications should be sent to syslog. The default
behaviour is not to send any. Less severe notifications always
imply logging more severe notifications: Setting this to OKAY means
all notifications will be sent to syslog, setting this to WARNING
will send WARNING and FAILURE notifications but will dismiss OKAY
notifications. Setting this option to FAILURE will only send
failures to syslog.

Plugin "table"
The "table plugin" provides generic means to parse tabular data and
dispatch user specified values. Values are selected based on column
numbers. For example, this plugin may be used to get values from the
Linux proc(5) filesystem or CSV (comma separated values) files.

<Plugin table>
<Table "/proc/slabinfo">
#Plugin "slab"
Instance "slabinfo"
Separator " "
<Result>
Type gauge
InstancePrefix "active_objs"
InstancesFrom 0
ValuesFrom 1
</Result>
<Result>
Type gauge
InstancePrefix "objperslab"
InstancesFrom 0
ValuesFrom 4
</Result>
</Table>
</Plugin>

The configuration consists of one or more Table blocks, each of which
configures one file to parse. Within each Table block, there are one or
more Result blocks, which configure which data to select and how to
interpret it.

The following options are available inside a Table block:

Plugin Plugin
If specified, Plugin is used as the plugin name when submitting
values. Defaults to table.

Instance instance
If specified, instance is used as the plugin instance. If omitted,
the filename of the table is used instead, with all special
characters replaced with an underscore ("_").

Separator string
Any character of string is interpreted as a delimiter between the
different columns of the table. A sequence of two or more
contiguous delimiters in the table is considered to be a single
delimiter, i. e. there cannot be any empty columns. The plugin uses
the strtok_r(3) function to parse the lines of a table - see its
documentation for more details. This option is mandatory.

A horizontal tab, newline and carriage return may be specified by
"\\t", "\\n" and "\\r" respectively. Please note that the double
backslashes are required because of collectd's config parsing.

The following options are available inside a Result block:

Type type
Sets the type used to dispatch the values to the daemon. Detailed
information about types and their configuration can be found in
types.db(5). This option is mandatory.

InstancePrefix prefix
If specified, prepend prefix to the type instance. If omitted, only
the InstancesFrom option is considered for the type instance.

InstancesFrom column0 [column1 ...]
If specified, the content of the given columns (identified by the
column number starting at zero) will be used to create the type
instance for each row. Multiple values (and the instance prefix)
will be joined together with dashes (-) as separation character. If
omitted, only the InstancePrefix option is considered for the type
instance.

The plugin itself does not check whether or not all built instances
are different. ItXs your responsibility to assure that each is
unique. This is especially true, if you do not specify
InstancesFrom: You have to make sure that the table only contains
one row.

If neither InstancePrefix nor InstancesFrom is given, the type
instance will be empty.

ValuesFrom column0 [column1 ...]
Specifies the columns (identified by the column numbers starting at
zero) whose content is used as the actual data for the data sets
that are dispatched to the daemon. How many such columns you need
is determined by the Type setting above. If you specify too many or
not enough columns, the plugin will complain about that and no data
will be submitted to the daemon. The plugin uses strtoll(3) and
strtod(3) to parse counter and gauge values respectively, so
anything supported by those functions is supported by the plugin as
well. This option is mandatory.

Plugin "tail"
The "tail plugin" follows logfiles, just like tail(1) does, parses each
line and dispatches found values. What is matched can be configured by
the user using (extended) regular expressions, as described in
regex(7).

<Plugin "tail">
<File "/var/log/exim4/mainlog">
Plugin "mail"
Instance "exim"
Interval 60
<Match>
Regex "S=([1-9][0-9]*)"
DSType "CounterAdd"
Type "ipt_bytes"
Instance "total"
</Match>
<Match>
Regex "\\<R=local_user\\>"
ExcludeRegex "\\<R=local_user\\>.*mail_spool defer"
DSType "CounterInc"
Type "counter"
Instance "local_user"
</Match>
<Match>
Regex "l=([0-9]*\\.[0-9]*)"
<DSType "Distribution">
Percentile 99
Bucket 0 100
#BucketType "bucket"
</DSType>
Type "latency"
Instance "foo"
</Match>
</File>
</Plugin>

The config consists of one or more File blocks, each of which
configures one logfile to parse. Within each File block, there are one
or more Match blocks, which configure a regular expression to search
for.

The Plugin and Instance options in the File block may be used to set
the plugin name and instance respectively. So in the above example the
plugin name "mail-exim" would be used.

These options are applied for all Match blocks that follow it, until
the next Plugin or Instance option. This way you can extract several
plugin instances from one logfile, handy when parsing syslog and the
like.

The Interval option allows you to define the length of time between
reads. If this is not set, the default Interval will be used.

Each Match block has the following options to describe how the match
should be performed:

Regex regex
Sets the regular expression to use for matching against a line. The
first subexpression has to match something that can be turned into
a number by strtoll(3) or strtod(3), depending on the value of
"CounterAdd", see below. Because extended regular expressions are
used, you do not need to use backslashes for subexpressions! If in
doubt, please consult regex(7). Due to collectd's config parsing
you need to escape backslashes, though. So if you want to match
literal parentheses you need to do the following:

Regex "SPAM \$Score: (-?[0-9]+\\.[0-9]+)\$"

ExcludeRegex regex
Sets an optional regular expression to use for excluding lines from
the match. An example which excludes all connections from
localhost from the match:

ExcludeRegex "127\\.0\\.0\\.1"

DSType Type
Sets how the values are cumulated. Type is one of:

GaugeAverage
Calculate the average of all values matched during the
interval.

GaugeMin
Report the smallest value matched during the interval.

GaugeMax
Report the greatest value matched during the interval.

GaugeLast
Report the last value matched during the interval.

GaugePersist
Report the last matching value. The metric is not reset to
"NaN" at the end of an interval. It is continuously reported
until another value is matched. This is intended for cases in
which only state changes are reported, for example a
thermometer that only reports the temperature when it changes.

CounterSet
DeriveSet
AbsoluteSet
The matched number is a counter. Simply sets the internal
counter to this value. Variants exist for "COUNTER", "DERIVE",
and "ABSOLUTE" data sources.

GaugeAdd
CounterAdd
DeriveAdd
Add the matched value to the internal counter. In case of
DeriveAdd, the matched number may be negative, which will
effectively subtract from the internal counter.

GaugeInc
CounterInc
DeriveInc
Increase the internal counter by one. These DSType are the only
ones that do not use the matched subexpression, but simply
count the number of matched lines. Thus, you may use a regular
expression without submatch in this case.

GaugeInc is reset to zero after every read, unlike other Gauge*
metrics which are reset to "NaN".

Distribution
Type to do calculations based on the distribution of values,
primarily calculating percentiles. This is primarily geared
towards latency, but can be used for other metrics as well. The
range of values tracked with this setting must be in the range
(0X2^34) and can be fractional. Please note that neither zero
nor 2^34 are inclusive bounds, i.e. zero cannot be handled by a
distribution.

This option must be used together with the Percentile and/or
Bucket options.

Synopsis:

<DSType "Distribution">
Percentile 99
Bucket 0 100
BucketType "bucket"
</DSType>

Percentile Percent
Calculate and dispatch the configured percentile, i.e.
compute the value, so that Percent of all matched values
are smaller than or equal to the computed latency.

Metrics are reported with the type Type (the value of the
above option) and the type instance
"[<Instance>-]<Percent>".

This option may be repeated to calculate more than one
percentile.

Bucket lower_bound upper_bound
Export the number of values (a "DERIVE") falling within the
given range. Both, lower_bound and upper_bound may be a
fractional number, such as 0.5. Each Bucket option
specifies an interval "(lower_bound, upper_bound]", i.e.
the range excludes the lower bound and includes the upper
bound. lower_bound and upper_bound may be zero, meaning no
lower/upper bound.

To export the entire (0Xinf) range without overlap, use the
upper bound of the previous range as the lower bound of the
following range. In other words, use the following schema:

Bucket 0 1
Bucket 1 2
Bucket 2 5
Bucket 5 10
Bucket 10 20
Bucket 20 50
Bucket 50 0

Metrics are reported with the type set by BucketType option
("bucket" by default) and the type instance
"<Type>[-<Instance>]-<lower_bound>_<upper_bound>".

This option may be repeated to calculate more than one
rate.

BucketType Type
Sets the type used to dispatch Bucket metrics. Optional,
by default "bucket" will be used.

The Gauge* and Distribution types interpret the submatch as a
floating point number, using strtod(3). The Counter* and
AbsoluteSet types interpret the submatch as an unsigned integer
using strtoull(3). The Derive* types interpret the submatch as a
signed integer using strtoll(3). CounterInc, DeriveInc and GaugeInc
do not use the submatch at all and it may be omitted in this case.

The Gauge* types, unless noted otherwise, are reset to "NaN" after
being reported. In other words, GaugeAverage reports the average of
all values matched since the last metric was reported (or "NaN" if
there was no match).

Type Type
Sets the type used to dispatch this value. Detailed information
about types and their configuration can be found in types.db(5).

Instance TypeInstance
This optional setting sets the type instance to use.

Plugin "tail_csv"
The tail_csv plugin reads files in the CSV format, e.g. the statistics
file written by Snort.

Synopsis:

<Plugin "tail_csv">
<Metric "snort-dropped">
Type "percent"
Instance "dropped"
ValueFrom 1
</Metric>
<File "/var/log/snort/snort.stats">
Plugin "snortstats"
Instance "eth0"
Interval 600
Collect "snort-dropped"
FieldSeparator ","
#TimeFrom 0
</File>
</Plugin>

The configuration consists of one or more Metric blocks that define an
index into the line of the CSV file and how this value is mapped to
collectd's internal representation. These are followed by one or more
Instance blocks which configure which file to read, in which interval
and which metrics to extract.

<Metric Name>
The Metric block configures a new metric to be extracted from the
statistics file and how it is mapped on collectd's data model. The
string Name is only used inside the Instance blocks to refer to
this block, so you can use one Metric block for multiple CSV files.

Type Type
Configures which Type to use when dispatching this metric.
Types are defined in the types.db(5) file, see the appropriate
manual page for more information on specifying types. Only
types with a single data source are supported by the tail_csv
plugin. The information whether the value is an absolute value
(i.e. a "GAUGE") or a rate (i.e. a "DERIVE") is taken from the
Type's definition.

Instance TypeInstance
If set, TypeInstance is used to populate the type instance
field of the created value lists. Otherwise, no type instance
is used.

ValueFrom Index
Configure to read the value from the field with the zero-based
index Index. If the value is parsed as signed integer,
unsigned integer or double depends on the Type setting, see
above.

<File Path>
Each File block represents one CSV file to read. There must be at
least one File block but there can be multiple if you have multiple
CSV files.

Plugin Plugin
Use Plugin as the plugin name when submitting values. Defaults
to "tail_csv".

Instance PluginInstance
Sets the plugin instance used when dispatching the values.

Collect Metric
Specifies which Metric to collect. This option must be
specified at least once, and you can use this option multiple
times to specify more than one metric to be extracted from this
statistic file.

Interval Seconds
Configures the interval in which to read values from this
instance / file. Defaults to the plugin's default interval.

TimeFrom Index
Rather than using the local time when dispatching a value, read
the timestamp from the field with the zero-based index Index.
The value is interpreted as seconds since epoch. The value is
parsed as a double and may be factional.

FieldSeparator Character
Specify the character to use as field separator while parsing
the CSV. Defaults to ',' if not specified. The value can only
be a single character.

Plugin "teamspeak2"
The "teamspeak2 plugin" connects to the query port of a teamspeak2
server and polls interesting global and virtual server data. The plugin
can query only one physical server but unlimited virtual servers. You
can use the following options to configure it:

Host hostname/ip
The hostname or ip which identifies the physical server. Default:
127.0.0.1

Port port
The query port of the physical server. This needs to be a string.
Default: "51234"

Server port
This option has to be added once for every virtual server the
plugin should query. If you want to query the virtual server on
port 8767 this is what the option would look like:

Server "8767"

This option, although numeric, needs to be a string, i. e. you must
use quotes around it! If no such statement is given only global
information will be collected.

Plugin "ted"
The TED plugin connects to a device of "The Energy Detective", a device
to measure power consumption. These devices are usually connected to a
serial (RS232) or USB port. The plugin opens a configured device and
tries to read the current energy readings. For more information on TED,
visit <http://www.theenergydetective.com/>.

Available configuration options:

Device Path
Path to the device on which TED is connected. collectd will need
read and write permissions on that file.

Default: /dev/ttyUSB0

Retries Num
Apparently reading from TED is not that reliable. You can therefore
configure a number of retries here. You only configure the retries
here, to if you specify zero, one reading will be performed (but no
retries if that fails); if you specify three, a maximum of four
readings are performed. Negative values are illegal.

Default: 0

Plugin "tcpconns"
The "tcpconns plugin" counts the number of currently established TCP
connections based on the local port and/or the remote port. Since there
may be a lot of connections the default if to count all connections
with a local port, for which a listening socket is opened. You can use
the following options to fine-tune the ports you are interested in:

ListeningPorts true|false
If this option is set to true, statistics for all local ports for
which a listening socket exists are collected. The default depends
on LocalPort and RemotePort (see below): If no port at all is
specifically selected, the default is to collect listening ports.
If specific ports (no matter if local or remote ports) are
selected, this option defaults to false, i. e. only the selected
ports will be collected unless this option is set to true
specifically.

LocalPort Port
Count the connections to a specific local port. This can be used to
see how many connections are handled by a specific daemon, e. g.
the mailserver. You have to specify the port in numeric form, so
for the mailserver example you'd need to set 25.

RemotePort Port
Count the connections to a specific remote port. This is useful to
see how much a remote service is used. This is most useful if you
want to know how many connections a local service has opened to
remote services, e. g. how many connections a mail server or news
server has to other mail or news servers, or how many connections a
web proxy holds to web servers. You have to give the port in
numeric form.

AllPortsSummary true|false
If this option is set to true a summary of statistics from all
connections are collected. This option defaults to false.

Plugin "thermal"
ForceUseProcfs true|false
By default, the Thermal plugin tries to read the statistics from
the Linux "sysfs" interface. If that is not available, the plugin
falls back to the "procfs" interface. By setting this option to
true, you can force the plugin to use the latter. This option
defaults to false.

Device Device
Selects the name of the thermal device that you want to collect or
ignore, depending on the value of the IgnoreSelected option. This
option may be used multiple times to specify a list of devices.

See /"IGNORELISTS" for details.

IgnoreSelected true|false
Invert the selection: If set to true, all devices except the ones
that match the device names specified by the Device option are
collected. By default only selected devices are collected if a
selection is made. If no selection is configured at all, all
devices are selected.

Plugin "threshold"
The Threshold plugin checks values collected or received by collectd
against a configurable threshold and issues notifications if values are
out of bounds.

Documentation for this plugin is available in the collectd-threshold(5)
manual page.

Plugin "tokyotyrant"
The TokyoTyrant plugin connects to a TokyoTyrant server and collects a
couple metrics: number of records, and database size on disk.

Host Hostname/IP
The hostname or IP which identifies the server. Default: 127.0.0.1

Port Service/Port
The query port of the server. This needs to be a string, even if
the port is given in its numeric form. Default: 1978

Plugin "turbostat"
The Turbostat plugin reads CPU frequency and C-state residency on
modern Intel processors by using Model Specific Registers.

CoreCstates Bitmask(Integer)
Bit mask of the list of core C-states supported by the processor.
This option should only be used if the automated detection fails.
Default value extracted from the CPU model and family.

Currently supported C-states (by this plugin): 3, 6, 7

Example:

All states (3, 6 and 7):
(1<<3) + (1<<6) + (1<<7) = 392

PackageCstates Bitmask(Integer)
Bit mask of the list of packages C-states supported by the
processor. This option should only be used if the automated
detection fails. Default value extracted from the CPU model and
family.

Currently supported C-states (by this plugin): 2, 3, 6, 7, 8, 9, 10

Example:

States 2, 3, 6 and 7:
(1<<2) + (1<<3) + (1<<6) + (1<<7) = 396

SystemManagementInterrupt true|false
Boolean enabling the collection of the I/O System-Management
Interrupt counter. This option should only be used if the
automated detection fails or if you want to disable this feature.

DigitalTemperatureSensor true|false
Boolean enabling the collection of the temperature of each core.
This option should only be used if the automated detection fails or
if you want to disable this feature.

TCCActivationTemp Temperature
Thermal Control Circuit Activation Temperature of the installed
CPU. This temperature is used when collecting the temperature of
cores or packages. This option should only be used if the automated
detection fails. Default value extracted from
MSR_IA32_TEMPERATURE_TARGET.

RunningAveragePowerLimit Bitmask(Integer)
Bit mask of the list of elements to be thermally monitored. This
option should only be used if the automated detection fails or if
you want to disable some collections. The different bits of this
bit mask accepted by this plugin are:

0 ('1'): Package
1 ('2'): DRAM
2 ('4'): Cores
3 ('8'): Embedded graphic device
LogicalCoreNames true|false
Boolean enabling the use of logical core numbering for per core
statistics. When enabled, "cpu<n>" is used as plugin instance,
where n is a dynamic number assigned by the kernel. Otherwise,
"core<n>" is used if there is only one package and "pkg<n>-core<m>"
if there is more than one, where n is the n-th core of package m.

RestoreAffinityPolicy AllCPUs|Restore
Reading data from CPU has side-effect: collectd process's CPU
affinity mask changes. After reading data is completed, affinity
mask needs to be restored. This option allows to set restore
policy.

AllCPUs (the default): Restore the affinity by setting affinity to
any/all CPUs.

Restore: Save affinity using sched_getaffinity() before reading
data and restore it after.

On some systems, sched_getaffinity() will fail due to inconsistency
of the CPU set size between userspace and kernel. In these cases
plugin will detect the unsuccessful call and fail with an error,
preventing data collection. Most of configurations does not need
to save affinity as Collectd process is allowed to run on any/all
available CPUs.

If you need to save and restore affinity and get errors like
'Unable to save the CPU affinity', setting 'possible_cpus' kernel
boot option may also help.

See following links for details:

<https://github.com/collectd/collectd/issues/1593>
<https://sourceware.org/bugzilla/show_bug.cgi?id=15630>
<https://bugzilla.kernel.org/show_bug.cgi?id=151821>

Plugin "ubi"
The Ubi plugin collects some statistics about the UBI (Unsorted Block
Image). Values collected are the number of bad physical eraseblocks on
the underlying MTD (Memory Technology Device) and the maximum erase
counter value concerning one volume.

See following links for details:

<http://www.linux-mtd.infradead.org/doc/ubi.html>
<http://www.linux-mtd.infradead.org/doc/ubifs.html>
<https://www.kernel.org/doc/Documentation/ABI/stable/sysfs-class-ubi>

Device Name
Select the device Name of the UBI volume. Whether it is collected
or ignored depends on the IgnoreSelected setting, see below.

See /"IGNORELISTS" for details.

IgnoreSelected true|false
Sets whether selected devices, i. e. the ones matches by any of the
Device statements, are ignored or if all other devices are ignored.
If no Device option is configured, all devices are collected. If at
least one Device is given and no IgnoreSelected or set to false,
only matching disks will be collected. If IgnoreSelectedis set to
true, all devices are collected except the ones matched.

Plugin "unixsock"
SocketFile Path
Sets the socket-file which is to be created.

SocketGroup Group
If running as root change the group of the UNIX-socket after it has
been created. Defaults to collectd.

DeleteSocket false|true
If set to true, delete the socket file before calling bind(2), if a
file with the given name already exists. If collectd crashes a
socket file may be left over, preventing the daemon from opening a
new socket when restarted. Since this is potentially dangerous,
this defaults to false.

Plugin "uuid"
This plugin, if loaded, causes the Hostname to be taken from the
machine's UUID. The UUID is a universally unique designation for the
machine, usually taken from the machine's BIOS. This is most useful if
the machine is running in a virtual environment such as Xen, in which
case the UUID is preserved across shutdowns and migration.

The following methods are used to find the machine's UUID, in order:

• Check /etc/uuid (or UUIDFile).

• Check for UUID from HAL
(<http://www.freedesktop.org/wiki/Software/hal>) if present.

• Check for UUID from "dmidecode" / SMBIOS.

• Check for UUID from Xen hypervisor.

If no UUID can be found then the hostname is not modified.

UUIDFile Path
Take the UUID from the given file (default /etc/uuid).

Plugin "varnish"
The varnish plugin collects information about Varnish, an HTTP
accelerator. It collects a subset of the values displayed by
varnishstat(1), and organizes them in categories which can be enabled
or disabled. Currently only metrics shown in varnishstat(1)'s MAIN
section are collected. The exact meaning of each metric can be found in
varnish-counters(7).

Synopsis:

<Plugin "varnish">
<Instance "example">
CollectBackend true
CollectBan false
CollectCache true
CollectConnections true
CollectDirectorDNS false
CollectESI false
CollectFetch false
CollectHCB false
CollectObjects false
CollectPurge false
CollectSession false
CollectSHM true
CollectSMA false
CollectSMS false
CollectSM false
CollectStruct false
CollectTotals false
CollectUptime false
CollectVCL false
CollectVSM false
CollectWorkers false
CollectLock false
CollectMempool false
CollectManagement false
CollectSMF false
CollectVBE false
CollectMSE false
</Instance>
</Plugin>

The configuration consists of one or more <Instance Name> blocks. Name
is the parameter passed to "varnishd -n". If left empty, it will
collectd statistics from the default "varnishd" instance (this should
work fine in most cases).

Inside each <Instance> blocks, the following options are recognized:

CollectBackend true|false
Back-end connection statistics, such as successful, reused, and
closed connections. True by default.

CollectBan true|false
Statistics about ban operations, such as number of bans added,
retired, and number of objects tested against ban operations. Only
available with Varnish 3.x and above. False by default.

CollectCache true|false
Cache hits and misses. True by default.

CollectConnections true|false
Number of client connections received, accepted and dropped. True
by default.

CollectDirectorDNS true|false
DNS director lookup cache statistics. Only available with Varnish
3.x. False by default.

CollectESI true|false
Edge Side Includes (ESI) parse statistics. False by default.

CollectFetch true|false
Statistics about fetches (HTTP requests sent to the backend). False
by default.

CollectHCB true|false
Inserts and look-ups in the crit bit tree based hash. Look-ups are
divided into locked and unlocked look-ups. False by default.

CollectObjects true|false
Statistics on cached objects: number of objects expired, nuked
(prematurely expired), saved, moved, etc. False by default.

CollectPurge true|false
Statistics about purge operations, such as number of purges added,
retired, and number of objects tested against purge operations.
Only available with Varnish 2.x. False by default.

CollectSession true|false
Client session statistics. Number of past and current sessions,
session herd and linger counters, etc. False by default. Note that
if using Varnish 4.x, some metrics found in the Connections and
Threads sections with previous versions of Varnish have been moved
here.

CollectSHM true|false
Statistics about the shared memory log, a memory region to store
log messages which is flushed to disk when full. True by default.

CollectSMA true|false
malloc or umem (umem_alloc(3MALLOC) based) storage statistics. The
umem storage component is Solaris specific. Note: SMA, SMF and MSE
share counters, enable only the one used by the Varnish instance.
Available with Varnish 2.x, varnish 4.x and above (Not available in
varnish 3.x). False by default.

CollectSMS true|false
synth (synthetic content) storage statistics. This storage
component is used internally only. False by default.

CollectSM true|false
file (memory mapped file) storage statistics. Only available with
Varnish 2.x, in varnish 4.x and above use CollectSMF. False by
default.

CollectStruct true|false
Current varnish internal state statistics. Number of current
sessions, objects in cache store, open connections to backends
(with Varnish 2.x), etc. False by default.

CollectTotals true|false
Collects overview counters, such as the number of sessions created,
the number of requests and bytes transferred. False by default.

CollectUptime true|false
Varnish uptime. Only available with Varnish 3.x and above. False by
default.

CollectVCL true|false
Number of total (available + discarded) VCL (config files). False
by default.

CollectVSM true|false
Collect statistics about Varnish's shared memory usage (used by the
logging and statistics subsystems). Only available with Varnish
4.x. False by default.

CollectWorkers true|false
Collect statistics about worker threads. False by default.

CollectVBE true|false
Backend counters. Only available with Varnish 4.x and above. False
by default.

CollectSMF true|false
file (memory mapped file) storage statistics. Only available with
Varnish 4.x and above. Note: SMA, SMF and MSE share counters,
enable only the one used by the Varnish instance. Used to be called
SM in Varnish 2.x. False by default.

CollectManagement true|false
Management process counters. Only available with Varnish 4.x and
above. False by default.

CollectLock true|false
Lock counters. Only available with Varnish 4.x and above. False by
default.

CollectMempool true|false
Memory pool counters. Only available with Varnish 4.x and above.
False by default.

CollectMSE true|false
Varnish Massive Storage Engine 2.0 (MSE2) is an improved storage
backend for Varnish, replacing the traditional malloc and file
storages. Only available with Varnish-Plus 4.x and above. Note:
SMA, SMF and MSE share counters, enable only the one used by the
Varnish instance. False by default.

CollectGOTO true|false
vmod-goto counters. Only available with Varnish Plus 6.x. False by
default.

Plugin "virt"
This plugin allows CPU, disk, network load and other metrics to be
collected for virtualized guests on the machine. The statistics are
collected through libvirt API (<http://libvirt.org/>). Majority of
metrics can be gathered without installing any additional software on
guests, especially collectd, which runs only on the host system.

Only Connection is required.

Consider the following example config:

<Plugin "virt">
Connection "qemu:///system"
HostnameFormat "hostname"
InterfaceFormat "address"
PluginInstanceFormat "name"
</Plugin>

It will generate the following values:

node42.example.com/virt-instance-0006f26c/disk_octets-vda
node42.example.com/virt-instance-0006f26c/disk_ops-vda
node42.example.com/virt-instance-0006f26c/if_dropped-ca:fe:ca:fe:ca:fe
node42.example.com/virt-instance-0006f26c/if_errors-ca:fe:ca:fe:ca:fe
node42.example.com/virt-instance-0006f26c/if_octets-ca:fe:ca:fe:ca:fe
node42.example.com/virt-instance-0006f26c/if_packets-ca:fe:ca:fe:ca:fe
node42.example.com/virt-instance-0006f26c/memory-actual_balloon
node42.example.com/virt-instance-0006f26c/memory-available
node42.example.com/virt-instance-0006f26c/memory-last_update
node42.example.com/virt-instance-0006f26c/memory-major_fault
node42.example.com/virt-instance-0006f26c/memory-minor_fault
node42.example.com/virt-instance-0006f26c/memory-rss
node42.example.com/virt-instance-0006f26c/memory-swap_in
node42.example.com/virt-instance-0006f26c/memory-swap_out
node42.example.com/virt-instance-0006f26c/memory-total
node42.example.com/virt-instance-0006f26c/memory-unused
node42.example.com/virt-instance-0006f26c/memory-usable
node42.example.com/virt-instance-0006f26c/virt_cpu_total
node42.example.com/virt-instance-0006f26c/virt_vcpu-0

You can get information on the metric's units from the online libvirt
documentation. For instance, virt_cpu_total is in nanoseconds.

Connection uri
Connect to the hypervisor given by uri. For example if using Xen
use:

Connection "xen:///"

Details which URIs allowed are given at
<http://libvirt.org/uri.html>.

RefreshInterval seconds
Refresh the list of domains and devices every seconds. The default
is 60 seconds. Setting this to be the same or smaller than the
Interval will cause the list of domains and devices to be refreshed
on every iteration.

Refreshing the devices in particular is quite a costly operation,
so if your virtualization setup is static you might consider
increasing this. If this option is set to 0, refreshing is disabled
completely.

Domain name
BlockDevice name:dev
InterfaceDevice name:dev
IgnoreSelected true|false
Select which domains and devices are collected.

If IgnoreSelected is not given or false then only the listed
domains and disk/network devices are collected.

If IgnoreSelected is true then the test is reversed and the listed
domains and disk/network devices are ignored, while the rest are
collected.

The domain name and device names may use a regular expression, if
the name is surrounded by /.../ and collectd was compiled with
support for regexps.

The default is to collect statistics for all domains and all their
devices.

Note: BlockDevice and InterfaceDevice options are related to
corresponding *Format options. Specifically, BlockDevice filtering
depends on BlockDeviceFormat setting - if user wants to filter
block devices by 'target' name then BlockDeviceFormat option has to
be set to 'target' and BlockDevice option must be set to a valid
block device target name("/:hdb/"). Mixing formats and filter
values from different worlds (i.e., using 'target' name as
BlockDevice value with BlockDeviceFormat set to 'source') may lead
to unexpected results (all devices filtered out or all visible,
depending on the value of IgnoreSelected option). Similarly,
option InterfaceDevice is related to InterfaceFormat setting (i.e.,
when user wants to use MAC address as a filter then InterfaceFormat
has to be set to 'address' - using wrong type here may filter out
all of the interfaces).

Example 1:

Ignore all hdb devices on any domain, but other block devices (eg.
hda) will be collected:

BlockDevice "/:hdb/"
IgnoreSelected "true"
BlockDeviceFormat "target"

Example 2:

Collect metrics only for block device on 'baremetal0' domain when
its 'source' matches given path:

BlockDevice "baremetal0:/var/db/libvirt/images/baremetal0.qcow2"
BlockDeviceFormat source

As you can see it is possible to filter devices/interfaces using
various formats - for block devices 'target' or 'source' name can
be used. Interfaces can be filtered using 'name', 'address' or
'number'.

Example 3:

Collect metrics only for domains 'baremetal0' and 'baremetal1' and
ignore any other domain:

Domain "baremetal0"
Domain "baremetal1"

It is possible to filter multiple block devices/domains/interfaces
by adding multiple filtering entries in separate lines.

BlockDeviceFormat target|source
If BlockDeviceFormat is set to target, the default, then the device
name seen by the guest will be used for reporting metrics. This
corresponds to the "<target>" node in the XML definition of the
domain.

If BlockDeviceFormat is set to source, then metrics will be
reported using the path of the source, e.g. an image file. This
corresponds to the "<source>" node in the XML definition of the
domain.

Example:

If the domain XML have the following device defined:

Setting "BlockDeviceFormat target" will cause the type instance to
be set to "sda". Setting "BlockDeviceFormat source" will cause the
type instance to be set to "var_lib_libvirt_images_image1.qcow2".

Note: this option determines also what field will be used for
filtering over block devices (filter value in BlockDevice will be
applied to target or source). More info about filtering block
devices can be found in the description of BlockDevice.

BlockDeviceFormatBasename false|true
The BlockDeviceFormatBasename controls whether the full path or the
basename(1) of the source is being used as the type instance when
BlockDeviceFormat is set to source. Defaults to false.

Example:

Assume the device path (source tag) is
"/var/db/libvirt/images/image1.qcow2". Setting
"BlockDeviceFormatBasename false" will cause the type instance to
be set to "var_lib_libvirt_images_image1.qcow2". Setting
"BlockDeviceFormatBasename true" will cause the type instance to be
set to "image1.qcow2".

HostnameFormat name|uuid|hostname|metadata...
When the virt plugin logs data, it sets the hostname of the
collected data according to this setting. The default is to use the
guest name as provided by the hypervisor, which is equal to setting
name.

uuid means use the guest's UUID. This is useful if you want to
track the same guest across migrations.

hostname means to use the global Hostname setting, which is
probably not useful on its own because all guests will appear to
have the same name. This is useful in conjunction with
PluginInstanceFormat though.

metadata means use information from guest's metadata. Use
HostnameMetadataNS and HostnameMetadataXPath to localize this
information.

You can also specify combinations of these fields. For example name
uuid means to concatenate the guest name and UUID (with a literal
colon character between, thus "foo:1234-1234-1234-1234").

At the moment of writing (collectd-5.5), hostname string is limited
to 62 characters. In case when combination of fields exceeds 62
characters, hostname will be truncated without a warning.

InterfaceFormat name|address|number
When the virt plugin logs interface data, it sets the name of the
collected data according to this setting. The default is to use the
path as provided by the hypervisor (the "dev" property of the
target node), which is equal to setting name.

address means use the interface's mac address. This is useful since
the interface path might change between reboots of a guest or
across migrations.

number means use the interface's number in guest.

Note: this option determines also what field will be used for
filtering over interface device (filter value in InterfaceDevice
will be applied to name, address or number). More info about
filtering interfaces can be found in the description of
InterfaceDevice.

PluginInstanceFormat name|uuid|metadata|none
When the virt plugin logs data, it sets the plugin_instance of the
collected data according to this setting. The default is to not set
the plugin_instance.

name means use the guest's name as provided by the hypervisor.
uuid means use the guest's UUID. metadata means use information
from guest's metadata.

You can also specify combinations of the name and uuid fields. For
example name uuid means to concatenate the guest name and UUID
(with a literal colon character between, thus
"foo:1234-1234-1234-1234").

HostnameMetadataNS string
When metadata is used in HostnameFormat or PluginInstanceFormat,
this selects in which metadata namespace we will pick the hostname.
The default is http://openstack.org/xmlns/libvirt/nova/1.0.

HostnameMetadataXPath string
When metadata is used in HostnameFormat or PluginInstanceFormat,
this describes where the hostname is located in the libvirt
metadata. The default is /instance/name/text().

ReportBlockDevices true|false
Enabled by default. Allows to disable stats reporting of block
devices for whole plugin.

ReportNetworkInterfaces true|false
Enabled by default. Allows to disable stats reporting of network
interfaces for whole plugin.

ExtraStats string
Report additional extra statistics. The default is no extra
statistics, preserving the previous behaviour of the plugin. If
unsure, leave the default. If enabled, allows the plugin to
reported more detailed statistics about the behaviour of Virtual
Machines. The argument is a space-separated list of selectors.

Currently supported selectors are:

cpu_util: report CPU utilization per domain in percentage.
disk: report extra statistics like number of flush operations and
total service time for read, write and flush operations. Requires
libvirt API version 0.9.5 or later.
disk_err: report disk errors if any occured. Requires libvirt API
version 0.9.10 or later.
domain_state: report domain state and reason as 'domain_state'
metric.
fs_info: report file system information as a notification. Requires
libvirt API version 1.2.11 or later. Can be collected only if Guest
Agent is installed and configured inside VM. Make sure that
installed Guest Agent version supports retrieving file system
information.
job_stats_background: report statistics about progress of a
background job on a domain. Only one type of job statistics can be
collected at the same time. Requires libvirt API version 1.2.9 or
later.
job_stats_completed: report statistics about a recently completed
job on a domain. Only one type of job statistics can be collected
at the same time. Requires libvirt API version 1.2.9 or later.
memory: report statistics about memory usage details, provided by
libvirt virDomainMemoryStats() function.
pcpu: report the physical user/system cpu time consumed by the
hypervisor, per-vm. Requires libvirt API version 0.9.11 or later.
perf: report performance monitoring events. To collect performance
metrics they must be enabled for domain and supported by the
platform. Requires libvirt API version 1.3.3 or later. Note: perf
metrics can't be collected if intel_rdt plugin is enabled.
vcpu: report domain virtual CPUs utilisation.
vcpupin: report pinning of domain VCPUs to host physical CPUs.
disk_physical: report 'disk_physical' statistic for disk device.
Note: This statistic is only reported for disk devices with
'source' property available.
disk_allocation: report 'disk_allocation' statistic for disk
device. Note: This statistic is only reported for disk devices with
'source' property available.
disk_capacity: report 'disk_capacity' statistic for disk device.
Note: This statistic is only reported for disk devices with
'source' property available.
PersistentNotification true|false
Override default configuration to only send notifications when
there is a change in the lifecycle state of a domain. When set to
true notifications will be sent for every read cycle. Default is
false. Does not affect the stats being dispatched.

Instances integer
How many read instances you want to use for this plugin. The
default is one, and the sensible setting is a multiple of the
ReadThreads value.

This option is only useful when domains are specially tagged. If
you are not sure, just use the default setting.

The reader instance will only query the domains with attached
matching tag. Tags should have the form of 'virt-X' where X is the
reader instance number, starting from 0.

The special-purpose reader instance #0, guaranteed to be always
present, will query all the domains with missing or unrecognized
tag, so no domain will ever be left out.

Domain tagging is done with a custom attribute in the libvirt
domain metadata section. Value is selected by an XPath
/domain/metadata/ovirtmap/tag/text() expression in the
http://ovirt.org/ovirtmap/tag/1.0 namespace. (XPath and namespace
values are not configurable yet).

Tagging could be used by management applications to evenly spread
the load among the reader threads, or to pin on the same threads
all the libvirt domains which use the same shared storage, to
minimize the disruption in presence of storage outages.

Plugin "vmem"
The "vmem" plugin collects information about the usage of virtual
memory. Since the statistics provided by the Linux kernel are very
detailed, they are collected very detailed. However, to get all the
details, you have to switch them on manually. Most people just want an
overview over, such as the number of pages read from swap space.

Verbose true|false
Enables verbose collection of information. This will start
collecting page "actions", e. g. page allocations, (de)activations,
steals and so on. Part of these statistics are collected on a "per
zone" basis.

Plugin "vserver"
This plugin doesn't have any options. VServer support is only available
for Linux. It cannot yet be found in a vanilla kernel, though. To make
use of this plugin you need a kernel that has VServer support built in,
i. e. you need to apply the patches and compile your own kernel, which
will then provide the /proc/virtual filesystem that is required by this
plugin.

The VServer homepage can be found at <http://linux-vserver.org/>.

Note: The traffic collected by this plugin accounts for the amount of
traffic passing a socket which might be a lot less than the actual on-
wire traffic (e. g. due to headers and retransmission). If you want to
collect on-wire traffic you could, for example, use the logging
facilities of iptables to feed data for the guest IPs into the iptables
plugin.

Plugin "write_graphite"
The "write_graphite" plugin writes data to Graphite, an open-source
metrics storage and graphing project. The plugin connects to Carbon,
the data layer of Graphite, via TCP or UDP and sends data via the "line
based" protocol (per default using port 2003). The data will be sent in
blocks of at most 1428 bytes to minimize the number of network packets.

Synopsis:

<Plugin write_graphite>
<Node "example">
Host "localhost"
Port "2003"
Protocol "tcp"
LogSendErrors true
Prefix "collectd"
UseTags false
ReverseHost false
</Node>
</Plugin>

The configuration consists of one or more <Node Name> blocks. Inside
the Node blocks, the following options are recognized:

Host Address
Hostname or address to connect to. Defaults to "localhost".

Port Service
Service name or port number to connect to. Defaults to 2003.

Protocol String
Protocol to use when connecting to Graphite. Defaults to "tcp".

ReconnectInterval Seconds
When set to non-zero, forces the connection to the Graphite backend
to be closed and re-opend periodically. This behavior is desirable
in environments where the connection to the Graphite backend is
done through load balancers, for example. When set to zero, the
default, the connetion is kept open for as long as possible.

LogSendErrors false|true
If set to true (the default), logs errors when sending data to
Graphite. If set to false, it will not log the errors. This is
especially useful when using Protocol UDP since many times we want
to use the "fire-and-forget" approach and logging errors fills
syslog with unneeded messages.

Prefix String
When UseTags is false, Prefix value is added in front of the host
name. When UseTags is true, Prefix value is added in front of
series name.

Dots and whitespace are not escaped in this string (see
EscapeCharacter below).

Postfix String
When UseTags is false, Postfix value appended to the host name.
When UseTags is true, Postgix value appended to the end of series
name (before the first ; that separates the name from the tags).

Dots and whitespace are not escaped in this string (see
EscapeCharacter below).

EscapeCharacter Char
Carbon uses the dot (".") as escape character and doesn't allow
whitespace in the identifier. The EscapeCharacter option determines
which character dots, whitespace and control characters are
replaced with. Defaults to underscore ("_").

StoreRates false|true
If set to true (the default), convert counter values to rates. If
set to false counter values are stored as is, i. e. as an
increasing integer number.

SeparateInstances false|true
If set to true, the plugin instance and type instance will be in
their own path component, for example "host.cpu.0.cpu.idle". If set
to false (the default), the plugin and plugin instance (and
likewise the type and type instance) are put into one component,
for example "host.cpu-0.cpu-idle".

Option value is not used when UseTags is true.

AlwaysAppendDS false|true
If set to true, append the name of the Data Source (DS) to the
"metric" identifier. If set to false (the default), this is only
done when there is more than one DS.

PreserveSeparator false|true
If set to false (the default) the "." (dot) character is replaced
with EscapeCharacter. Otherwise, if set to true, the "." (dot)
character is preserved, i.e. passed through.

Option value is not used when UseTags is true.

DropDuplicateFields false|true
If set to true, detect and remove duplicate components in Graphite
metric names. For example, the metric name
"host.load.load.shortterm" will be shortened to
"host.load.shortterm".

UseTags false|true
If set to true, Graphite metric names will be generated as tagged
series. This allows for much more flexibility than the traditional
hierarchical layout.

Example:
"test.single;host=example.com;plugin=test;plugin_instance=foo;type=single;type_instance=bar"

You can use Postfix option to add more tags by specifying it like
";tag1=value1;tag2=value2". Note what tagging support was added
since Graphite version 1.1.x.

If set to true, the SeparateInstances and PreserveSeparator
settings are not used.

Default value: false.

ReverseHost false|true
If set to true, the (dot separated) parts of the host field of the
value list will be rewritten in reverse order. The rewrite happens
before special characters are replaced with the EscapeCharacter.

This option might be convenient if the metrics are presented with
Graphite in a DNS like tree structure (probably without replacing
dots in hostnames).

Example:
Hostname "node3.cluster1.example.com"
LoadPlugin "cpu"
LoadPlugin "write_graphite"
<Plugin "write_graphite">
<Node "graphite.example.com">
EscapeCharacter "."
ReverseHost true
</Node>
</Plugin>

result on the wire: com.example.cluster1.node3.cpu-0.cpu-idle 99.900993 1543010932

Default value: false.

Plugin "write_log"
The "write_log" plugin writes metrics as INFO log messages.

This plugin supports two output formats: Graphite and JSON.

Synopsis:

<Plugin write_log>
Format Graphite
</Plugin>

Format Format
The output format to use. Can be one of "Graphite" or "JSON".

Plugin "write_tsdb"
The "write_tsdb" plugin writes data to OpenTSDB, a scalable open-source
time series database. The plugin connects to a TSD, a masterless, no
shared state daemon that ingests metrics and stores them in HBase. The
plugin uses TCP over the "line based" protocol with a default port
4242. The data will be sent in blocks of at most 1428 bytes to minimize
the number of network packets.

Synopsis:

<Plugin write_tsdb>
ResolveInterval 60
ResolveJitter 60
<Node "example">
Host "tsd-1.my.domain"
Port "4242"
HostTags "status=production"
</Node>
</Plugin>

The configuration consists of one or more <Node Name> blocks and global
directives.

Global directives are:

ResolveInterval seconds
ResolveJitter seconds
When collectd connects to a TSDB node, it will request the hostname
from DNS. This can become a problem if the TSDB node is unavailable
or badly configured because collectd will request DNS in order to
reconnect for every metric, which can flood your DNS. So you can
cache the last value for ResolveInterval seconds. Defaults to the
Interval of the write_tsdb plugin, e.g. 10 seconds.

You can also define a jitter, a random interval to wait in addition
to ResolveInterval. This prevents all your collectd servers to
resolve the hostname at the same time when the connection fails.
Defaults to the Interval of the write_tsdb plugin, e.g. 10 seconds.

Note: If the DNS resolution has already been successful when the
socket closes, the plugin will try to reconnect immediately with
the cached information. DNS is queried only when the socket is
closed for a longer than ResolveInterval + ResolveJitter seconds.

Inside the Node blocks, the following options are recognized:

Host Address
Hostname or address to connect to. Defaults to "localhost".

Port Service
Service name or port number to connect to. Defaults to 4242.

HostTags String
When set, HostTags is added to the end of the metric. It is
intended to be used for name=value pairs that the TSD will tag the
metric with. Dots and whitespace are not escaped in this string.

StoreRates false|true
If set to true, convert counter values to rates. If set to false
(the default) counter values are stored as is, as an increasing
integer number.

AlwaysAppendDS false|true
If set the true, append the name of the Data Source (DS) to the
"metric" identifier. If set to false (the default), this is only
done when there is more than one DS.

Plugin "write_mongodb"
The write_mongodb plugin will send values to MongoDB, a schema-less
NoSQL database.

Synopsis:

<Plugin "write_mongodb">
<Node "default">
Host "localhost"
Port "27017"
Timeout 1000
StoreRates true
</Node>
</Plugin>

The plugin can send values to multiple instances of MongoDB by
specifying one Node block for each instance. Within the Node blocks,
the following options are available:

Host Address
Hostname or address to connect to. Defaults to "localhost".

Port Service
Service name or port number to connect to. Defaults to 27017.

Timeout Milliseconds
Set the timeout for each operation on MongoDB to Timeout
milliseconds. Setting this option to zero means no timeout, which
is the default.

StoreRates false|true
If set to true (the default), convert counter values to rates. If
set to false counter values are stored as is, i.e. as an increasing
integer number.

Database Database
User User
Password Password
Sets the information used when authenticating to a MongoDB
database. The fields are optional (in which case no authentication
is attempted), but if you want to use authentication all three
fields must be set.

Plugin "write_prometheus"
The write_prometheus plugin implements a tiny webserver that can be
scraped using Prometheus.

Options:

Host Host
Bind to the hostname / address Host. By default, the plugin will
bind to the "any" address, i.e. accept packets sent to any of the
hosts addresses.

This option is supported only for libmicrohttpd newer than 0.9.0.

Port Port
Port the embedded webserver should listen on. Defaults to 9103.

StalenessDelta Seconds
Time in seconds after which Prometheus considers a metric "stale"
if it hasn't seen any update for it. This value must match the
setting in Prometheus. It defaults to 300 seconds (5 minutes),
same as Prometheus.

Background:

Prometheus has a global setting, "StalenessDelta", which controls
after which time a metric without updates is considered "stale".
This setting effectively puts an upper limit on the interval in
which metrics are reported.

When the write_prometheus plugin encounters a metric with an
interval exceeding this limit, it will inform you, the user, and
provide the metric to Prometheus without a timestamp. That causes
Prometheus to consider the metric "fresh" each time it is scraped,
with the time of the scrape being considered the time of the
update. The result is that there appear more datapoints in
Prometheus than were actually created, but at least the metric
doesn't disappear periodically.

Plugin "write_http"
This output plugin submits values to an HTTP server using POST requests
and encoding metrics with JSON or using the "PUTVAL" command described
in collectd-unixsock(5).

Synopsis:

<Plugin "write_http">
<Node "example">
URL "http://example.com/post-collectd"
User "collectd"
Password "weCh3ik0"
Format JSON
</Node>
</Plugin>

The plugin can send values to multiple HTTP servers by specifying one
<Node Name> block for each server. Within each Node block, the
following options are available:

URL URL
URL to which the values are submitted to. Mandatory.

User Username
Optional user name needed for authentication.

Password Password
Optional password needed for authentication.

VerifyPeer true|false
Enable or disable peer SSL certificate verification. See
<http://curl.haxx.se/docs/sslcerts.html> for details. Enabled by
default.

CAPath Directory
Directory holding one or more CA certificate files. You can use
this if for some reason all the needed CA certificates aren't in
the same file and can't be pointed to using the CACert option.
Requires "libcurl" to be built against OpenSSL.

ClientKey File
File that holds the private key in PEM format to be used for
certificate-based authentication.

ClientCert File
File that holds the SSL certificate to be used for certificate-
based authentication.

ClientKeyPass Password
Password required to load the private key in ClientKey.

Header Header
A HTTP header to add to the request. Multiple headers are added if
this option is specified more than once. Example:

Header "X-Custom-Header: custom_value"

Format Command|JSON|KAIROSDB
Format of the output to generate. If set to Command, will create
output that is understood by the Exec and UnixSock plugins. When
set to JSON, will create output in the JavaScript Object Notation
(JSON). When set to KAIROSDB , will create output in the KairosDB
format.

Defaults to Command.

Attribute String String
Only available for the KAIROSDB output format.

Consider the two given strings to be the key and value of an
additional tag for each metric being sent out.

You can add multiple Attribute.

TTL Int
Only available for the KAIROSDB output format.

Sets the Cassandra ttl for the data points.

Please refer to
<http://kairosdb.github.io/docs/build/html/restapi/AddDataPoints.html?highlight=ttl>

Prefix String
Only available for the KAIROSDB output format.

Sets the metrics prefix string. Defaults to collectd.

Metrics true|false
Controls whether metrics are POSTed to this location. Defaults to
true.

Notifications false|true
Controls whether notifications are POSTed to this location.
Defaults to false.

StoreRates true|false
If set to true, convert counter values to rates. If set to false
(the default) counter values are stored as is, i.e. as an
increasing integer number.

BufferSize Bytes
Sets the send buffer size to Bytes. By increasing this buffer, less
HTTP requests will be generated, but more metrics will be batched /
metrics are cached for longer before being sent, introducing
additional delay until they are available on the server side. Bytes
must be at least 1024 and cannot exceed the size of an "int", i.e.
2 GByte. Defaults to 4096.

LowSpeedLimit Bytes per Second
Sets the minimal transfer rate in Bytes per Second below which the
connection with the HTTP server will be considered too slow and
aborted. All the data submitted over this connection will probably
be lost. Defaults to 0, which means no minimum transfer rate is
enforced.

Timeout Timeout
Sets the maximum time in milliseconds given for HTTP POST
operations to complete. When this limit is reached, the POST
operation will be aborted, and all the data in the current send
buffer will probably be lost. Defaults to 0, which means the
connection never times out.

LogHttpError false|true
Enables printing of HTTP error code to log. Turned off by default.

<Statistics Name>
One Statistics block can be used to specify cURL statistics to be
collected for each request to the remote URL. See the section "cURL
Statistics" above for details.

The "write_http" plugin regularly submits the collected values to
the HTTP server. How frequently this happens depends on how much
data you are collecting and the size of BufferSize. The optimal
value to set Timeout to is slightly below this interval, which you
can estimate by monitoring the network traffic between collectd and
the HTTP server.

Plugin "write_influxdb_udp"
The write_influxdb_udp plugin sends data to a instance of InfluxDB
using the "Line Protocol". Each plugin is sent as a measurement with a
time precision of miliseconds while plugin instance, type and type
instance are sent as tags.

<Plugin "write_influxdb_udp">
Server "influxdb.internal.tld"
StoreRates "yes"
</Plugin>

<Server Host [Port]>
The Server statement sets the server to send datagrams to.

The argument Host may be a hostname, an IPv4 address or an IPv6
address. The optional second argument specifies a port number or a
service name. If not given, the default, 8089, is used.

StoreRates true|false
If set to true, convert absolute, counter and derive values to
rates. If set to false (the default) absolute, counter and derive
values are sent as is.

Plugin "write_kafka"
The write_kafka plugin will send values to a Kafka topic, a distributed
queue. Synopsis:

<Plugin "write_kafka">
Property "metadata.broker.list" "broker1:9092,broker2:9092"
<Topic "collectd">
Format JSON
</Topic>
</Plugin>

The following options are understood by the write_kafka plugin:

<Topic Name>
The plugin's configuration consists of one or more Topic blocks.
Each block is given a unique Name and specifies one kafka producer.
Inside the Topic block, the following per-topic options are
understood:

Property String String
Configure the named property for the current topic. Properties
are forwarded to the kafka producer library librdkafka.

Key String
Use the specified string as a partitioning key for the topic.
Kafka breaks topic into partitions and guarantees that for a
given topology, the same consumer will be used for a specific
key. The special (case insensitive) string Random can be used
to specify that an arbitrary partition should be used.

Format Command|JSON|Graphite
Selects the format in which messages are sent to the broker. If
set to Command (the default), values are sent as "PUTVAL"
commands which are identical to the syntax used by the Exec and
UnixSock plugins.

If set to JSON, the values are encoded in the JavaScript Object
Notation, an easy and straight forward exchange format.

If set to Graphite, values are encoded in the Graphite format,
which is "<metric> <value> <timestamp>\n".

StoreRates true|false
Determines whether or not "COUNTER", "DERIVE" and "ABSOLUTE"
data sources are converted to a rate (i.e. a "GAUGE" value). If
set to false (the default), no conversion is performed.
Otherwise the conversion is performed using the internal value
cache.

Please note that currently this option is only used if the
Format option has been set to JSON.

GraphitePrefix (Format=Graphite only)
A prefix can be added in the metric name when outputting in the
Graphite format.

When GraphiteUseTags is false, prefix is added before the Host
name. Metric name will be
"<prefix><host><postfix><plugin><type><name>"

When GraphiteUseTags is true, prefix is added in front of
series name.

GraphitePostfix (Format=Graphite only)
A postfix can be added in the metric name when outputting in
the Graphite format.

When GraphiteUseTags is false, postfix is added after the Host
name. Metric name will be
"<prefix><host><postfix><plugin><type><name>"

When GraphiteUseTags is true, prefix value appended to the end
of series name (before the first ; that separates the name from
the tags).

GraphiteEscapeChar (Format=Graphite only)
Specify a character to replace dots (.) in the host part of the
metric name. In Graphite metric name, dots are used as
separators between different metric parts (host, plugin, type).
Default is "_" (Underscore).

GraphiteSeparateInstances false|true
If set to true, the plugin instance and type instance will be
in their own path component, for example "host.cpu.0.cpu.idle".
If set to false (the default), the plugin and plugin instance
(and likewise the type and type instance) are put into one
component, for example "host.cpu-0.cpu-idle".

Option value is not used when GraphiteUseTags is true.

GraphiteAlwaysAppendDS true|false
If set to true, append the name of the Data Source (DS) to the
"metric" identifier. If set to false (the default), this is
only done when there is more than one DS.

GraphitePreserveSeparator false|true
If set to false (the default) the "." (dot) character is
replaced with GraphiteEscapeChar. Otherwise, if set to true,
the "." (dot) character is preserved, i.e. passed through.

Option value is not used when GraphiteUseTags is true.

GraphiteUseTags false|true
If set to true Graphite metric names will be generated as
tagged series.

Default value: false.

StoreRates true|false
If set to true (the default), convert counter values to rates.
If set to false counter values are stored as is, i.e. as an
increasing integer number.

This will be reflected in the "ds_type" tag: If StoreRates is
enabled, converted values will have "rate" appended to the data
source type, e.g. "ds_type:derive:rate".

Property String String
Configure the kafka producer through properties, you almost always
will want to set metadata.broker.list to your Kafka broker list.

Plugin "write_redis"
The write_redis plugin submits values to Redis, a data structure
server.

Synopsis:

<Plugin "write_redis">
<Node "example">
Host "localhost"
Port "6379"
Timeout 1000
Prefix "collectd/"
Database 1
MaxSetSize -1
MaxSetDuration -1
StoreRates true
</Node>
</Plugin>

Values are submitted to Sorted Sets, using the metric name as the key,
and the timestamp as the score. Retrieving a date range can then be
done using the "ZRANGEBYSCORE" Redis command. Additionally, all the
identifiers of these Sorted Sets are kept in a Set called
"collectd/values" (or "${prefix}/values" if the Prefix option was
specified) and can be retrieved using the "SMEMBERS" Redis command. You
can specify the database to use with the Database parameter (default is
0). See <http://redis.io/commands#sorted_set> and
<http://redis.io/commands#set> for details.

The information shown in the synopsis above is the default
configuration which is used by the plugin if no configuration is
present.

The plugin can send values to multiple instances of Redis by specifying
one Node block for each instance. Within the Node blocks, the following
options are available:

Node Nodename
The Node block identifies a new Redis node, that is a new Redis
instance running on a specified host and port. The node name is a
canonical identifier which is used as plugin instance. It is
limited to 51 characters in length.

Host Hostname
The Host option is the hostname or IP-address where the Redis
instance is running on.

Timeout Milliseconds
The Timeout option sets the socket connection timeout, in
milliseconds.

Prefix Prefix
Prefix used when constructing the name of the Sorted Sets and the
Set containing all metrics. Defaults to "collectd/", so metrics
will have names like "collectd/cpu-0/cpu-user". When setting this
to something different, it is recommended but not required to
include a trailing slash in Prefix.

Database Index
This index selects the redis database to use for writing
operations. Defaults to 0.

MaxSetSize Items
The MaxSetSize option limits the number of items that the Sorted
Sets can hold. Negative values for Items sets no limit, which is
the default behavior.

MaxSetDuration Seconds
The MaxSetDuration option limits the duration of items that the
Sorted Sets can hold. Negative values for Items sets no duration,
which is the default behavior.

StoreRates true|false
If set to true (the default), convert counter values to rates. If
set to false counter values are stored as is, i.e. as an increasing
integer number.

Plugin "write_riemann"
The write_riemann plugin will send values to Riemann, a powerful stream
aggregation and monitoring system. The plugin sends Protobuf encoded
data to Riemann using UDP packets.

Synopsis:

<Plugin "write_riemann">
<Node "example">
Host "localhost"
Port "5555"
Protocol UDP
StoreRates true
AlwaysAppendDS false
TTLFactor 2.0
</Node>
Tag "foobar"
Attribute "foo" "bar"
</Plugin>

The following options are understood by the write_riemann plugin:

<Node Name>
The plugin's configuration consists of one or more Node blocks.
Each block is given a unique Name and specifies one connection to
an instance of Riemann. Indise the Node block, the following per-
connection options are understood:

Host Address
Hostname or address to connect to. Defaults to "localhost".

Port Service
Service name or port number to connect to. Defaults to 5555.

Protocol UDP|TCP|TLS
Specify the protocol to use when communicating with Riemann.
Defaults to TCP.

TLSCertFile Path
When using the TLS protocol, path to a PEM certificate to
present to remote host.

TLSCAFile Path
When using the TLS protocol, path to a PEM CA certificate to
use to validate the remote hosts's identity.

TLSKeyFile Path
When using the TLS protocol, path to a PEM private key
associated with the certificate defined by TLSCertFile.

Batch true|false
If set to true and Protocol is set to TCP, events will be
batched in memory and flushed at regular intervals or when
BatchMaxSize is exceeded.

Notifications are not batched and sent as soon as possible.

When enabled, it can occur that events get processed by the
Riemann server close to or after their expiration time. Tune
the TTLFactor and BatchMaxSize settings according to the amount
of values collected, if this is an issue.

Defaults to true

BatchMaxSize size
Maximum payload size for a riemann packet. Defaults to 8192

BatchFlushTimeout seconds
Maximum amount of seconds to wait in between to batch flushes.
No timeout by default.

StoreRates true|false
If set to true (the default), convert counter values to rates.
If set to false counter values are stored as is, i.e. as an
increasing integer number.

This will be reflected in the "ds_type" tag: If StoreRates is
enabled, converted values will have "rate" appended to the data
source type, e.g. "ds_type:derive:rate".

AlwaysAppendDS false|true
If set to true, append the name of the Data Source (DS) to the
"service", i.e. the field that, together with the "host" field,
uniquely identifies a metric in Riemann. If set to false (the
default), this is only done when there is more than one DS.

TTLFactor Factor
Riemann events have a Time to Live (TTL) which specifies how
long each event is considered active. collectd populates this
field based on the metrics interval setting. This setting
controls the factor with which the interval is multiplied to
set the TTL. The default value is 2.0. Unless you know exactly
what you're doing, you should only increase this setting from
its default value.

Notifications false|true
If set to true, create riemann events for notifications. This
is true by default. When processing thresholds from
write_riemann, it might prove useful to avoid getting
notification events.

CheckThresholds false|true
If set to true, attach state to events based on thresholds
defined in the Threshold plugin. Defaults to false.

EventServicePrefix String
Add the given string as a prefix to the event service name. If
EventServicePrefix not set or set to an empty string (""), no
prefix will be used.

Tag String
Add the given string as an additional tag to the metric being sent
to Riemann.

Attribute String String
Consider the two given strings to be the key and value of an
additional attribute for each metric being sent out to Riemann.

Plugin "write_sensu"
The write_sensu plugin will send values to Sensu, a powerful stream
aggregation and monitoring system. The plugin sends JSON encoded data
to a local Sensu client using a TCP socket.

Synopsis:

<Plugin "write_sensu">
<Node "example">
Host "localhost"
Port "3030"
StoreRates true
AlwaysAppendDS false
IncludeSource false
MetricHandler "influx"
MetricHandler "default"
NotificationHandler "flapjack"
NotificationHandler "howling_monkey"
Notifications true
</Node>
Tag "foobar"
Attribute "foo" "bar"
</Plugin>

The following options are understood by the write_sensu plugin:

<Node Name>
The plugin's configuration consists of one or more Node blocks.
Each block is given a unique Name and specifies one connection to
an instance of Sensu. Inside the Node block, the following per-
connection options are understood:

Host Address
Hostname or address to connect to. Defaults to "localhost".

Port Service
Service name or port number to connect to. Defaults to 3030.

StoreRates true|false
If set to true (the default), convert counter values to rates.
If set to false counter values are stored as is, i.e. as an
increasing integer number.

This will be reflected in the "collectd_data_source_type" tag:
If StoreRates is enabled, converted values will have "rate"
appended to the data source type, e.g.
"collectd_data_source_type:derive:rate".

AlwaysAppendDS false|true
If set the true, append the name of the Data Source (DS) to the
"service", i.e. the field that, together with the "host" field,
uniquely identifies a metric in Sensu. If set to false (the
default), this is only done when there is more than one DS.

Notifications false|true
If set to true, create Sensu events for notifications. This is
false by default. At least one of Notifications or Metrics
should be enabled.

Metrics false|true
If set to true, create Sensu events for metrics. This is false
by default. At least one of Notifications or Metrics should be
enabled.

Separator String
Sets the separator for Sensu metrics name or checks. Defaults
to "/".

MetricHandler String
Add a handler that will be set when metrics are sent to Sensu.
You can add several of them, one per line. Defaults to no
handler.

NotificationHandler String
Add a handler that will be set when notifications are sent to
Sensu. You can add several of them, one per line. Defaults to
no handler.

EventServicePrefix String
Add the given string as a prefix to the event service name. If
EventServicePrefix not set or set to an empty string (""), no
prefix will be used.

Tag String
Add the given string as an additional tag to the metric being sent
to Sensu.

Attribute String String
Consider the two given strings to be the key and value of an
additional attribute for each metric being sent out to Sensu.

IncludeSource false|true
If set to true, then the source host of the metrics/notification is
passed on to sensu using the source attribute. This may register
the host as a proxy client in sensu.

If set to false (the default), then the hostname is discarded,
making it appear as if the event originated from the connected
sensu agent.

Plugin "write_stackdriver"
The "write_stackdriver" plugin writes metrics to the Google Stackdriver
Monitoring service.

This plugin supports two authentication methods: When configured,
credentials are read from the JSON credentials file specified with
CredentialFile. Alternatively, when running on Google Compute Engine
(GCE), an OAuth token is retrieved from the metadata server and used to
authenticate to GCM.

Synopsis:

<Plugin write_stackdriver>
CredentialFile "/path/to/service_account.json"
<Resource "global">
Label "project_id" "monitored_project"
</Resource>
</Plugin>

CredentialFile file
Path to a JSON credentials file holding the credentials for a GCP
service account.

If CredentialFile is not specified, the plugin uses Application
Default Credentials. That means which credentials are used depends
on the environment:

• The environment variable "GOOGLE_APPLICATION_CREDENTIALS" is
checked. If this variable is specified it should point to a
JSON file that defines the credentials.

• The path
"${HOME}/.config/gcloud/application_default_credentials.json"
is checked. This where credentials used by the gcloud command
line utility are stored. You can use "gcloud auth
application-default login" to create these credentials.

Please note that these credentials are often of your personal
account, not a service account, and are therefore unfit to be
used in a production environment.

• When running on GCE, the built-in service account associated
with the virtual machine instance is used. See also the Email
option below.

Project Project
The Project ID or the Project Number of the Stackdriver Account.
The Project ID is a string identifying the GCP project, which you
can chose freely when creating a new project. The Project Number is
a 12-digit decimal number. You can look up both on the Developer
Console.

This setting is optional. If not set, the project ID is read from
the credentials file or determined from the GCE's metadata service.

Email Email (GCE only)
Choses the GCE Service Account used for authentication.

Each GCE instance has a "default" Service Account but may also be
associated with additional Service Accounts. This is often used to
restrict the permissions of services running on the GCE instance to
the required minimum. The write_stackdriver plugin requires the
"https://www.googleapis.com/auth/monitoring" scope. When multiple
Service Accounts are available, this option selects which one is
used by write_stackdriver plugin.

Resource ResourceType
Configures the Monitored Resource to use when storing metrics.
More information on Monitored Resources and Monitored Resource
Types are available at
<https://cloud.google.com/monitoring/api/resources>.

This block takes one string argument, the ResourceType. Inside the
block are one or more Label options which configure the resource
labels.

This block is optional. The default value depends on the runtime
environment: on GCE, the "gce_instance" resource type is used,
otherwise the "global" resource type ist used:

• On GCE, defaults to the equivalent of this config:

<Resource "gce_instance">
Label "project_id" "<project_id>"
Label "instance_id" "<instance_id>"
Label "zone" "<zone>"
</Resource>

The values for project_id, instance_id and zone are read from
the GCE metadata service.

• Elsewhere, i.e. not on GCE, defaults to the equivalent of this
config:

<Resource "global">
Label "project_id" "<Project>"
</Resource>

Where Project refers to the value of the Project option or the
project ID inferred from the CredentialFile.

Url Url
URL of the Stackdriver Monitoring API. Defaults to
"https://monitoring.googleapis.com/v3".

Plugin "write_syslog"
The "write_syslog" plugin writes data in syslog format log messages.
It implements the basic syslog protocol, RFC 5424, extends it with
content-based filtering, rich filtering capabilities, flexible
configuration options and adds features such as using TCP for
transport. The plugin can connect to a Syslog daemon, like syslog-ng
and rsyslog, that will ingest metrics, transform and ship them to the
specified output. The plugin uses TCP over the "line based" protocol
with a default port 44514. The data will be sent in blocks of at most
1428 bytes to minimize the number of network packets.

Synopsis:

<Plugin write_syslog>
ResolveInterval 60
ResolveJitter 60
<Node "example">
Host "syslog-1.my.domain"
Port "44514"
Prefix "collectd"
MessageFormat "human"
HostTags ""
</Node>
</Plugin>

The configuration consists of one or more <Node Name> blocks and global
directives.

Global directives are:

ResolveInterval seconds
ResolveJitter seconds
When collectd connects to a syslog node, it will request the
hostname from DNS. This can become a problem if the syslog node is
unavailable or badly configured because collectd will request DNS
in order to reconnect for every metric, which can flood your DNS.
So you can cache the last value for ResolveInterval seconds.
Defaults to the Interval of the write_syslog plugin, e.g.
10 seconds.

Inside the Node blocks, the following options are recognized:

Host Address
Hostname or address to connect to. Defaults to "localhost".

Port Service
Service name or port number to connect to. Defaults to 44514.

HostTags String
When set, HostTags is added to the end of the metric. It is
intended to be used for adding additional metadata to tag the
metric with. Dots and whitespace are not escaped in this string.

Examples:

When MessageFormat is set to "human".

["prefix1" "example1"="example1_v"]["prefix2" "example2"="example2_v"]"

When MessageFormat is set to "JSON", text should be in JSON format.
Escaping the quotation marks is required.

HostTags "\"prefix1\": {\"example1\":\"example1_v\",\"example2\":\"example2_v\"}"

MessageFormat String
MessageFormat selects the format in which messages are sent to the
syslog deamon, human or JSON. Defaults to human.

Syslog message format:

<priority>VERSION ISOTIMESTAMP HOSTNAME APPLICATION PID MESSAGEID
STRUCTURED-DATA MSG

The difference between the message formats are in the STRUCTURED-
DATA and MSG parts.

Human format:

<166>1 ISOTIMESTAMP HOSTNAME collectd PID MESSAGEID
["collectd" "value": "v1" "plugin"="plugin_v" "plugin_instance"="plugin_instance_v"
"type_instance"="type_instance_v" "type"="type_v" "ds_name"="ds_name_v" "interval"="interval_v" ]
"host_tag_example"="host_tag_example_v" plugin_v.type_v.ds_name_v="v1"

JSON format:

<166>1 ISOTIMESTAMP HOSTNAME collectd PID MESSAGEID STRUCTURED-DATA
{
"collectd": {
"time": time_as_epoch, "interval": interval_v, "plugin": "plugin_v",
"plugin_instance": "plugin_instance_v", "type":"type_v",
"type_instance": "type_instance_v", "plugin_v": {"type_v": v1}
} , "host":"host_v", "host_tag_example": "host_tag_example_v"
}

StoreRates false|true
If set to true, convert counter values to rates. If set to false
(the default) counter values are stored as is, as an increasing
integer number.

AlwaysAppendDS false|true
If set to true, append the name of the Data Source (DS) to the
"metric" identifier. If set to false (the default), this is only
done when there is more than one DS.

Prefix String
When set, Prefix is added to all metrics names as a prefix. It is
intended in case you want to be able to define the source of the
specific metric. Dots and whitespace are not escaped in this
string.

Plugin "xencpu"
This plugin collects metrics of hardware CPU load for machine running
Xen hypervisor. Load is calculated from 'idle time' value, provided by
Xen. Result is reported using the "percent" type, for each CPU (core).

This plugin doesn't have any options (yet).

Plugin "zookeeper"
The zookeeper plugin will collect statistics from a Zookeeper server
using the mntr command. It requires Zookeeper 3.4.0+ and access to the
client port.

Synopsis:

Host Address
Hostname or address to connect to. Defaults to "localhost".

Port Service
Service name or port number to connect to. Defaults to 2181.

THRESHOLD CONFIGURATION
Starting with version 4.3.0 collectd has support for monitoring. By
that we mean that the values are not only stored or sent somewhere, but
that they are judged and, if a problem is recognized, acted upon. The
only action collectd takes itself is to generate and dispatch a
"notification". Plugins can register to receive notifications and
perform appropriate further actions.

Since systems and what you expect them to do differ a lot, you can
configure thresholds for your values freely. This gives you a lot of
flexibility but also a lot of responsibility.

Every time a value is out of range a notification is dispatched. This
means that the idle percentage of your CPU needs to be less then the
configured threshold only once for a notification to be generated.
There's no such thing as a moving average or similar - at least not
now.

Also, all values that match a threshold are considered to be relevant
or "interesting". As a consequence collectd will issue a notification
if they are not received for Timeout iterations. The Timeout
configuration option is explained in section "GLOBAL OPTIONS". If, for
example, Timeout is set to "2" (the default) and some hosts sends it's
CPU statistics to the server every 60 seconds, a notification will be
dispatched after about 120 seconds. It may take a little longer because
the timeout is checked only once each Interval on the server.

When a value comes within range again or is received after it was
missing, an "OKAY-notification" is dispatched.

Here is a configuration example to get you started. Read below for more
information.

<Plugin threshold>
<Type "foo">
WarningMin 0.00
WarningMax 1000.00
FailureMin 0.00
FailureMax 1200.00
Invert false
Instance "bar"
</Type>

<Plugin "interface">
Instance "eth0"
<Type "if_octets">
FailureMax 10000000
DataSource "rx"
</Type>
</Plugin>

<Host "hostname">
<Type "cpu">
Instance "idle"
FailureMin 10
</Type>

<Plugin "memory">
<Type "memory">
Instance "cached"
WarningMin 100000000
</Type>
</Plugin>
</Host>
</Plugin>

There are basically two types of configuration statements: The "Host",
"Plugin", and "Type" blocks select the value for which a threshold
should be configured. The "Plugin" and "Type" blocks may be specified
further using the "Instance" option. You can combine the block by
nesting the blocks, though they must be nested in the above order,
i. e. "Host" may contain either "Plugin" and "Type" blocks, "Plugin"
may only contain "Type" blocks and "Type" may not contain other blocks.
If multiple blocks apply to the same value the most specific block is
used.

The other statements specify the threshold to configure. They must be
included in a "Type" block. Currently the following statements are
recognized:

FailureMax Value
WarningMax Value
Sets the upper bound of acceptable values. If unset defaults to
positive infinity. If a value is greater than FailureMax a FAILURE
notification will be created. If the value is greater than
WarningMax but less than (or equal to) FailureMax a WARNING
notification will be created.

FailureMin Value
WarningMin Value
Sets the lower bound of acceptable values. If unset defaults to
negative infinity. If a value is less than FailureMin a FAILURE
notification will be created. If the value is less than WarningMin
but greater than (or equal to) FailureMin a WARNING notification
will be created.

DataSource DSName
Some data sets have more than one "data source". Interesting
examples are the "if_octets" data set, which has received ("rx")
and sent ("tx") bytes and the "disk_ops" data set, which holds
"read" and "write" operations. The system load data set, "load",
even has three data sources: "shortterm", "midterm", and
"longterm".

Normally, all data sources are checked against a configured
threshold. If this is undesirable, or if you want to specify
different limits for each data source, you can use the DataSource
option to have a threshold apply only to one data source.

Invert true|false
If set to true the range of acceptable values is inverted, i. e.
values between FailureMin and FailureMax (WarningMin and
WarningMax) are not okay. Defaults to false.

Persist true|false
Sets how often notifications are generated. If set to true one
notification will be generated for each value that is out of the
acceptable range. If set to false (the default) then a notification
is only generated if a value is out of range but the previous value
was okay.

This applies to missing values, too: If set to true a notification
about a missing value is generated once every Interval seconds. If
set to false only one such notification is generated until the
value appears again.

Percentage true|false
If set to true, the minimum and maximum values given are
interpreted as percentage value, relative to the other data
sources. This is helpful for example for the "df" type, where you
may want to issue a warning when less than 5 % of the total space
is available. Defaults to false.

Hits Number
Delay creating the notification until the threshold has been passed
Number times. When a notification has been generated, or when a
subsequent value is inside the threshold, the counter is reset. If,
for example, a value is collected once every 10 seconds and Hits is
set to 3, a notification will be dispatched at most once every
30 seconds.

This is useful when short bursts are not a problem. If, for
example, 100% CPU usage for up to a minute is normal (and data is
collected every 10 seconds), you could set Hits to 6 to account for
this.

Hysteresis Number
When set to non-zero, a hysteresis value is applied when checking
minimum and maximum bounds. This is useful for values that increase
slowly and fluctuate a bit while doing so. When these values come
close to the threshold, they may "flap", i.e. switch between
failure / warning case and okay case repeatedly.

If, for example, the threshold is configures as

WarningMax 100.0
Hysteresis 1.0

then a Warning notification is created when the value exceeds 101
and the corresponding Okay notification is only created once the
value falls below 99, thus avoiding the "flapping".

FILTER CONFIGURATION
Starting with collectd 4.6 there is a powerful filtering infrastructure
implemented in the daemon. The concept has mostly been copied from
ip_tables, the packet filter infrastructure for Linux. We'll use a
similar terminology, so that users that are familiar with iptables feel
right at home.

Terminology
The following are the terms used in the remainder of the filter
configuration documentation. For an ASCII-art schema of the mechanism,
see "General structure" below.

Match
A match is a criteria to select specific values. Examples are, of
course, the name of the value or it's current value.

Matches are implemented in plugins which you have to load prior to
using the match. The name of such plugins starts with the "match_"
prefix.

Target
A target is some action that is to be performed with data. Such
actions could, for example, be to change part of the value's
identifier or to ignore the value completely.

Some of these targets are built into the daemon, see "Built-in
targets" below. Other targets are implemented in plugins which you
have to load prior to using the target. The name of such plugins
starts with the "target_" prefix.

Rule
The combination of any number of matches and at least one target is
called a rule. The target actions will be performed for all values
for which all matches apply. If the rule does not have any matches
associated with it, the target action will be performed for all
values.

Chain
A chain is a list of rules and possibly default targets. The rules
are tried in order and if one matches, the associated target will
be called. If a value is handled by a rule, it depends on the
target whether or not any subsequent rules are considered or if
traversal of the chain is aborted, see "Flow control" below. After
all rules have been checked, the default targets will be executed.

General structure
The following shows the resulting structure:

+---------+
! Chain !
+---------+
!
V
+---------+ +---------+ +---------+ +---------+
! Rule !->! Match !->! Match !->! Target !
+---------+ +---------+ +---------+ +---------+
!
V
+---------+ +---------+ +---------+
! Rule !->! Target !->! Target !
+---------+ +---------+ +---------+
!
V
:
:
!
V
+---------+ +---------+ +---------+
! Rule !->! Match !->! Target !
+---------+ +---------+ +---------+
!
V
+---------+
! Default !
! Target !
+---------+

Flow control
There are four ways to control which way a value takes through the
filter mechanism:

jump
The built-in jump target can be used to "call" another chain, i. e.
process the value with another chain. When the called chain
finishes, usually the next target or rule after the jump is
executed.

stop
The stop condition, signaled for example by the built-in target
stop, causes all processing of the value to be stopped immediately.

return
Causes processing in the current chain to be aborted, but
processing of the value generally will continue. This means that if
the chain was called via Jump, the next target or rule after the
jump will be executed. If the chain was not called by another
chain, control will be returned to the daemon and it may pass the
value to another chain.

continue
Most targets will signal the continue condition, meaning that
processing should continue normally. There is no special built-in
target for this condition.

Synopsis
The configuration reflects this structure directly:

PostCacheChain "PostCache"
<Chain "PostCache">
<Rule "ignore_mysql_show">
<Match "regex">
Plugin "^mysql$"
Type "^mysql_command$"
TypeInstance "^show_"
</Match>
<Target "stop">
</Target>
</Rule>
<Target "write">
Plugin "rrdtool"
</Target>
</Chain>

The above configuration example will ignore all values where the plugin
field is "mysql", the type is "mysql_command" and the type instance
begins with "show_". All other values will be sent to the "rrdtool"
write plugin via the default target of the chain. Since this chain is
run after the value has been added to the cache, the MySQL "show_*"
command statistics will be available via the "unixsock" plugin.

List of configuration options
PreCacheChain ChainName
PostCacheChain ChainName
Configure the name of the "pre-cache chain" and the "post-cache
chain". The argument is the name of a chain that should be executed
before and/or after the values have been added to the cache.

To understand the implications, it's important you know what is
going on inside collectd. The following diagram shows how values
are passed from the read-plugins to the write-plugins:

+---------------+
! Read-Plugin !
+-------+-------+
!
+ - - - - V - - - - +
: +---------------+ :
: ! Pre-Cache ! :
: ! Chain ! :
: +-------+-------+ :
: ! :
: V :
: +-------+-------+ : +---------------+
: ! Cache !--->! Value Cache !
: ! insert ! : +---+---+-------+
: +-------+-------+ : ! !
: ! ,------------' !
: V V : V
: +-------+---+---+ : +-------+-------+
: ! Post-Cache +--->! Write-Plugins !
: ! Chain ! : +---------------+
: +---------------+ :
: :
: dispatch values :
+ - - - - - - - - - +

After the values are passed from the "read" plugins to the dispatch
functions, the pre-cache chain is run first. The values are added
to the internal cache afterwards. The post-cache chain is run after
the values have been added to the cache. So why is it such a huge
deal if chains are run before or after the values have been added
to this cache?

Targets that change the identifier of a value list should be
executed before the values are added to the cache, so that the name
in the cache matches the name that is used in the "write" plugins.
The "unixsock" plugin, too, uses this cache to receive a list of
all available values. If you change the identifier after the value
list has been added to the cache, this may easily lead to
confusion, but it's not forbidden of course.

The cache is also used to convert counter values to rates. These
rates are, for example, used by the "value" match (see below). If
you use the rate stored in the cache before the new value is added,
you will use the old, previous rate. Write plugins may use this
rate, too, see the "csv" plugin, for example. The "unixsock"
plugin uses these rates too, to implement the "GETVAL" command.

Last but not last, the stop target makes a difference: If the pre-
cache chain returns the stop condition, the value will not be added
to the cache and the post-cache chain will not be run.

Chain Name
Adds a new chain with a certain name. This name can be used to
refer to a specific chain, for example to jump to it.

Within the Chain block, there can be Rule blocks and Target blocks.

Rule [Name]
Adds a new rule to the current chain. The name of the rule is
optional and currently has no meaning for the daemon.

Within the Rule block, there may be any number of Match blocks and
there must be at least one Target block.

Match Name
Adds a match to a Rule block. The name specifies what kind of match
should be performed. Available matches depend on the plugins that
have been loaded.

The arguments inside the Match block are passed to the plugin
implementing the match, so which arguments are valid here depends
on the plugin being used. If you do not need any to pass any
arguments to a match, you can use the shorter syntax:

Match "foobar"

Which is equivalent to:

Target Name
Add a target to a rule or a default target to a chain. The name
specifies what kind of target is to be added. Which targets are
available depends on the plugins being loaded.

The arguments inside the Target block are passed to the plugin
implementing the target, so which arguments are valid here depends
on the plugin being used. If you do not need any to pass any
arguments to a target, you can use the shorter syntax:

Target "stop"

This is the same as writing:

Built-in targets
The following targets are built into the core daemon and therefore need
no plugins to be loaded:

return
Signals the "return" condition, see the "Flow control" section
above. This causes the current chain to stop processing the value
and returns control to the calling chain. The calling chain will
continue processing targets and rules just after the jump target
(see below). This is very similar to the RETURN target of iptables,
see iptables(8).

This target does not have any options.

Example:

Target "return"

stop
Signals the "stop" condition, see the "Flow control" section above.
This causes processing of the value to be aborted immediately. This
is similar to the DROP target of iptables, see iptables(8).

This target does not have any options.

Example:

Target "stop"

write
Sends the value to "write" plugins.

Available options:

Plugin Name
Name of the write plugin to which the data should be sent. This
option may be given multiple times to send the data to more
than one write plugin. If the plugin supports multiple
instances, the plugin's instance(s) must also be specified.

If no plugin is explicitly specified, the values will be sent to
all available write plugins.

Single-instance plugin example:

<Target "write">
Plugin "rrdtool"
</Target>

Multi-instance plugin example:

<Plugin "write_graphite">
<Node "foo">
...
</Node>
<Node "bar">
...
</Node>
</Plugin>
...
<Target "write">
Plugin "write_graphite/foo"
</Target>

jump
Starts processing the rules of another chain, see "Flow control"
above. If the end of that chain is reached, or a stop condition is
encountered, processing will continue right after the jump target,
i. e. with the next target or the next rule. This is similar to the
-j command line option of iptables, see iptables(8).

Available options:

Chain Name
Jumps to the chain Name. This argument is required and may
appear only once.

Example:

<Target "jump">
Chain "foobar"
</Target>

Available matches
regex
Matches a value using regular expressions.

Available options:

Host Regex
Plugin Regex
PluginInstance Regex
Type Regex
TypeInstance Regex
MetaData String Regex
Match values where the given regular expressions match the
various fields of the identifier of a value. If multiple
regular expressions are given, all regexen must match for a
value to match.

Invert false|true
When set to true, the result of the match is inverted, i.e. all
value lists where all regular expressions apply are not
matched, all other value lists are matched. Defaults to false.

Example:

<Match "regex">
Host "customer[0-9]+"
Plugin "^foobar$"
</Match>

timediff
Matches values that have a time which differs from the time on the
server.

This match is mainly intended for servers that receive values over
the "network" plugin and write them to disk using the "rrdtool"
plugin. RRDtool is very sensitive to the timestamp used when
updating the RRD files. In particular, the time must be ever
increasing. If a misbehaving client sends one packet with a
timestamp far in the future, all further packets with a correct
time will be ignored because of that one packet. What's worse, such
corrupted RRD files are hard to fix.

This match lets one match all values outside a specified time range
(relative to the server's time), so you can use the stop target
(see below) to ignore the value, for example.

Available options:

Future Seconds
Matches all values that are ahead of the server's time by
Seconds or more seconds. Set to zero for no limit. Either
Future or Past must be non-zero.

Past Seconds
Matches all values that are behind of the server's time by
Seconds or more seconds. Set to zero for no limit. Either
Future or Past must be non-zero.

Example:

<Match "timediff">
Future 300
Past 3600
</Match>

This example matches all values that are five minutes or more ahead
of the server or one hour (or more) lagging behind.

value
Matches the actual value of data sources against given minimum /
maximum values. If a data-set consists of more than one data-
source, all data-sources must match the specified ranges for a
positive match.

Available options:

Min Value
Sets the smallest value which still results in a match. If
unset, behaves like negative infinity.

Max Value
Sets the largest value which still results in a match. If
unset, behaves like positive infinity.

Invert true|false
Inverts the selection. If the Min and Max settings result in a
match, no-match is returned and vice versa. Please note that
the Invert setting only effects how Min and Max are applied to
a specific value. Especially the DataSource and Satisfy
settings (see below) are not inverted.

DataSource DSName [DSName ...]
Select one or more of the data sources. If no data source is
configured, all data sources will be checked. If the type
handled by the match does not have a data source of the
specified name(s), this will always result in no match
(independent of the Invert setting).

Satisfy Any|All
Specifies how checking with several data sources is performed.
If set to Any, the match succeeds if one of the data sources is
in the configured range. If set to All the match only succeeds
if all data sources are within the configured range. Default is
All.

Usually All is used for positive matches, Any is used for
negative matches. This means that with All you usually check
that all values are in a "good" range, while with Any you check
if any value is within a "bad" range (or outside the "good"
range).

Either Min or Max, but not both, may be unset.

Example:

# Match all values smaller than or equal to 100. Matches only if all data
# sources are below 100.
<Match "value">
Max 100
Satisfy "All"
</Match>

# Match if the value of any data source is outside the range of 0 - 100.
<Match "value">
Min 0
Max 100
Invert true
Satisfy "Any"
</Match>

empty_counter
Matches all values with one or more data sources of type COUNTER
and where all counter values are zero. These counters usually never
increased since they started existing (and are therefore
uninteresting), or got reset recently or overflowed and you had
really, really bad luck.

Please keep in mind that ignoring such counters can result in
confusing behavior: Counters which hardly ever increase will be
zero for long periods of time. If the counter is reset for some
reason (machine or service restarted, usually), the graph will be
empty (NAN) for a long time. People may not understand why.

hashed
Calculates a hash value of the host name and matches values
according to that hash value. This makes it possible to divide all
hosts into groups and match only values that are in a specific
group. The intended use is in load balancing, where you want to
handle only part of all data and leave the rest for other servers.

The hashing function used tries to distribute the hosts evenly.
First, it calculates a 32 bit hash value using the characters of
the hostname:

hash_value = 0;
for (i = 0; host[i] != 0; i++)
hash_value = (hash_value * 251) + host[i];

The constant 251 is a prime number which is supposed to make this
hash value more random. The code then checks the group for this
host according to the Total and Match arguments:

if ((hash_value % Total) == Match)
matches;
else
does not match;

Please note that when you set Total to two (i. e. you have only two
groups), then the least significant bit of the hash value will be
the XOR of all least significant bits in the host name. One
consequence is that when you have two hosts, "server0.example.com"
and "server1.example.com", where the host name differs in one digit
only and the digits differ by one, those hosts will never end up in
the same group.

Available options:

Match Match Total
Divide the data into Total groups and match all hosts in group
Match as described above. The groups are numbered from zero,
i. e. Match must be smaller than Total. Total must be at least
one, although only values greater than one really do make any
sense.

You can repeat this option to match multiple groups, for
example:

Match 3 7
Match 5 7

The above config will divide the data into seven groups and
match groups three and five. One use would be to keep every
value on two hosts so that if one fails the missing data can
later be reconstructed from the second host.

Example:

# Operate on the pre-cache chain, so that ignored values are not even in the
# global cache.
<Chain "PreCache">
<Rule>
<Match "hashed">
# Divide all received hosts in seven groups and accept all hosts in
# group three.
Match 3 7
</Match>
# If matched: Return and continue.
Target "return"
</Rule>
# If not matched: Return and stop.
Target "stop"
</Chain>

Available targets
notification
Creates and dispatches a notification.

Available options:

Message String
This required option sets the message of the notification. The
following placeholders will be replaced by an appropriate
value:

%{host}
%{plugin}
%{plugin_instance}
%{type}
%{type_instance}
These placeholders are replaced by the identifier field of
the same name.

%{ds:name}
These placeholders are replaced by a (hopefully) human
readable representation of the current rate of this data
source. If you changed the instance name (using the set or
replace targets, see below), it may not be possible to
convert counter values to rates.

Please note that these placeholders are case sensitive!

Severity "FAILURE"|"WARNING"|"OKAY"
Sets the severity of the message. If omitted, the severity
"WARNING" is used.

Example:

<Target "notification">
Message "Oops, the %{type_instance} temperature is currently %{ds:value}!"
Severity "WARNING"
</Target>

replace
Replaces parts of the identifier using regular expressions.

Available options:

Host Regex Replacement
Plugin Regex Replacement
PluginInstance Regex Replacement
TypeInstance Regex Replacement
MetaData String Regex Replacement
DeleteMetaData String Regex
Match the appropriate field with the given regular expression
Regex. If the regular expression matches, that part that
matches is replaced with Replacement. If multiple places of the
input buffer match a given regular expression, only the first
occurrence will be replaced.

You can specify each option multiple times to use multiple
regular expressions one after another.

Example:

<Target "replace">
# Replace "example.net" with "example.com"
Host "\\<example.net\\>" "example.com"

# Strip "www." from hostnames
Host "\\<www\\." ""
</Target>

set Sets part of the identifier of a value to a given string.

Available options:

Host String
Plugin String
PluginInstance String
TypeInstance String
MetaData String String
Set the appropriate field to the given string. The strings for
plugin instance, type instance, and meta data may be empty, the
strings for host and plugin may not be empty. It's currently
not possible to set the type of a value this way.

The following placeholders will be replaced by an appropriate
value:

%{host}
%{plugin}
%{plugin_instance}
%{type}
%{type_instance}
These placeholders are replaced by the identifier field of
the same name.

%{meta:name}
These placeholders are replaced by the meta data value with
the given name.

Please note that these placeholders are case sensitive!

DeleteMetaData String
Delete the named meta data field.

Example:

<Target "set">
PluginInstance "coretemp"
TypeInstance "core3"
</Target>

Backwards compatibility
If you use collectd with an old configuration, i. e. one without a
Chain block, it will behave as it used to. This is equivalent to the
following configuration:

<Chain "PostCache">
Target "write"
</Chain>

If you specify a PostCacheChain, the write target will not be added
anywhere and you will have to make sure that it is called where
appropriate. We suggest to add the above snippet as default target to
your "PostCache" chain.

Examples
Ignore all values, where the hostname does not contain a dot, i. e.
can't be an FQDN.

<Chain "PreCache">
<Rule "no_fqdn">
<Match "regex">
Host "^[^\.]*$"
</Match>
Target "stop"
</Rule>
Target "write"
</Chain>

IGNORELISTS
Ignorelists are a generic framework to either ignore some metrics or
report specific metrics only. Plugins usually provide one or more
options to specify the items (mounts points, devices, ...) and the
boolean option "IgnoreSelected".

Select String
Selects the item String. This option often has a plugin specific
name, e.g. Sensor in the "sensors" plugin. It is also plugin
specific what this string is compared to. For example, the "df"
plugin's MountPoint compares it to a mount point and the "sensors"
plugin's Sensor compares it to a sensor name.

By default, this option is doing a case-sensitive full-string
match. The following config will match "foo", but not "Foo":

Select "foo"

If String starts and ends with "/" (a slash), the string is
compiled as a regular expression. For example, so match all item
starting with "foo", use could use the following syntax:

Select "/^foo/"

The regular expression is not anchored, i.e. the following config
will match "foobar", "barfoo" and "AfooZ":

Select "/foo/"

The Select option may be repeated to select multiple items.

IgnoreSelected true|false
If set to true, matching metrics are ignored and all other metrics
are collected. If set to false, matching metrics are collected and
all other metrics are ignored.

SEE ALSO
collectd(1), collectd-exec(5), collectd-perl(5), collectd-unixsock(5),
types.db(5), hddtemp(8), iptables(8), kstat(3KSTAT), mbmon(1), psql(1),
regex(7), rrdtool(1), sensors(1)

AUTHOR
Florian Forster <octo@collectd.org>

5.12.0.git 2025-04-17 COLLECTD.CONF(5)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=collectd.conf&sektion=5&manpath=FreeBSD+Ports+14.3.quarterly>

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