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VARNISH-COUNTERS(7) Miscellaneous Information Manual VARNISH-COUNTERS(7) NAME varnish-counters - Varnish counter field definitions a LOCK COUNTERS Counters which track the activity in the different classes of mu- tex-locks. The counts may be slightly wrong if there are more than one lock instan- tiated in each class (ie: .creat > 1) creat a counter - debug Created locks destroy a counter - debug Destroyed locks locks a counter - debug Lock Operations dbg_busy a counter - debug Contended lock operations If the lck debug bit is set: Lock operations which returned EBUSY on the first locking attempt. If the lck debug bit is unset, this counter will never be incremented even if lock operations are contended. dbg_try_fail a counter - debug Contended trylock operations If the lck debug bit is set: Trylock operations which returned EBUSY. If the lck debug bit is unset, this counter will never be incremented even if lock operations are contended. a MAIN COUNTERS summs a counter - debug stat summ operations Number of times per-thread statistics were summed into the global coun- ters. uptime a counter - info Child process uptime How long the child process has been running. sess_conn a counter - info Sessions accepted Count of sessions successfully accepted sess_fail a counter - info Session accept failures Count of failures to accept TCP connection. This counter is the sum of the sess_fail_* counters, which give more de- tailed information. sess_fail_econnaborted a counter - info Session accept failures: connection aborted Detailed reason for sess_fail: Connection aborted by the client, usually harmless. sess_fail_eintr a counter - info Session accept failures: interrupted system call Detailed reason for sess_fail: The accept() call was interrupted, usu- ally harmless sess_fail_emfile a counter - info Session accept failures: too many open files Detailed reason for sess_fail: No file descriptor was available. Con- sider raising RLIMIT_NOFILE (see ulimit -n). sess_fail_ebadf a counter - info Session accept failures: bad file descriptor Detailed reason for sess_fail: The listen socket file descriptor was in- valid. Should never happen. sess_fail_enomem a counter - info Session accept failures: not enough memory Detailed reason for sess_fail: Most likely insufficient socket buffer memory. Should never happen sess_fail_other a counter - info Session accept failures: other Detailed reason for sess_fail: neither of the above, see SessError log (varnishlog -g raw -i SessError). client_req_400 a counter - info Client requests received, subject to 400 errors 400 means we couldn't make sense of the request, it was malformed in some drastic way. client_req_417 a counter - info Client requests received, subject to 417 errors 417 means that something went wrong with an Expect: header. client_req a counter - info Good client requests received The count of parseable client requests seen. esi_req a counter - info ESI subrequests Number of ESI subrequests made. cache_hit a counter - info Cache hits Count of cache hits. A cache hit indicates that an object has been de- livered to a client without fetching it from a backend server. cache_hit_grace a counter - info Cache grace hits Count of cache hits with grace. A cache hit with grace is a cache hit where the object is expired. Note that such hits are also included in the cache_hit counter. cache_hitpass a counter - info Cache hits for pass. Count of hits for pass. A cache hit for pass indicates that Varnish is going to pass the request to the backend and this decision has been cached in it self. This counts how many times the cached decision is be- ing used. cache_hitmiss a counter - info Cache hits for miss. Count of hits for miss. A cache hit for miss indicates that Varnish is going to proceed as for a cache miss without request coalescing, and this decision has been cached. This counts how many times the cached de- cision is being used. cache_miss a counter - info Cache misses Count of misses. A cache miss indicates the object was fetched from the backend before delivering it to the client. beresp_uncacheable a counter - info Uncacheable backend responses Count of backend responses considered uncacheable. beresp_shortlived a counter - info Shortlived objects Count of objects created with ttl+grace+keep shorter than the 'short- lived' runtime parameter. backend_conn a counter - info Backend conn. success How many backend connections have successfully been established. backend_unhealthy a counter - info Backend conn. not attempted backend_busy a counter - info Backend conn. too many backend_fail a counter - info Backend conn. failures backend_reuse a counter - info Backend conn. reuses Count of backend connection reuses. This counter is increased whenever we reuse a recycled connection. backend_recycle a counter - info Backend conn. recycles Count of backend connection recycles. This counter is increased whenever we have a keep-alive connection that is put back into the pool of con- nections. It has not yet been used, but it might be, unless the backend closes it. backend_retry a counter - info Backend conn. retry backend_wait a counter - info Backend conn. waited in queue for a connection Count of backend requests that waited in a backend_wait queue for a con- nection to become available. The size of a backend wait queue is de- fined by the backend wait_limit property. The wait queue is only used when max_connections to the backend are in use. backend_wait_fail a counter - info Backend conn. waited in queue and did not get a connection Count of backend requests that waited in a backend_wait queue for a con- nection to become available and did not get one (timed out). The maxi- mum time to wait in the queue is defined by the backend wait_timeout property. fetch_head a counter - info Fetch no body (HEAD) beresp with no body because the request is HEAD. fetch_length a counter - info Fetch with Length beresp.body with Content-Length. fetch_chunked a counter - info Fetch chunked beresp.body with Chunked. fetch_eof a counter - info Fetch EOF beresp.body with EOF. fetch_bad a counter - info Fetch bad T-E beresp.body length/fetch could not be determined. fetch_none a counter - info Fetch no body beresp.body empty fetch_1xx a counter - info Fetch no body (1xx) beresp with no body because of 1XX response. fetch_204 a counter - info Fetch no body (204) beresp with no body because of 204 response. fetch_304 a counter - info Fetch no body (304) beresp with no body because of 304 response. fetch_failed a counter - info Fetch failed (all causes) beresp fetch failed. bgfetch_no_thread a counter - info Background fetch failed (no thread) A bgfetch triggered by a grace hit failed, no thread available. pools a gauge - info Number of thread pools Number of thread pools. See also parameter thread_pools. NB: Presently pools cannot be removed once created. threads a gauge - info Total number of threads Number of threads in all pools. See also parameters thread_pools, thread_pool_min and thread_pool_max. threads_limited a counter - info Threads hit max Number of times more threads were needed, but limit was reached in a thread pool. See also parameter thread_pool_max. threads_created a counter - info Threads created Total number of threads created in all pools. threads_destroyed a counter - info Threads destroyed Total number of threads destroyed in all pools. threads_failed a counter - info Thread creation failed Number of times creating a thread failed. See VSL::Debug for diagnos- tics. See also parameter thread_fail_delay. thread_queue_len a gauge - info Length of session queue Length of session queue waiting for threads. NB: Only updates once per second. See also parameter thread_queue_limit. busy_sleep a counter - info Number of requests sent to sleep on busy objhdr Number of requests sent to sleep without a worker thread because they found a busy object. busy_wakeup a counter - info Number of requests woken after sleep on busy objhdr Number of requests taken off the busy object sleep list and rescheduled. busy_killed a counter - info Number of requests killed after sleep on busy objhdr Number of requests killed from the busy object sleep list due to lack of resources. sess_queued a counter - info Sessions queued for thread Number of times session was queued waiting for a thread. See also para- meter thread_queue_limit. sess_dropped a counter - info Sessions dropped for thread Number of times an HTTP/1 session was dropped because the queue was too long already. See also parameter thread_queue_limit. req_dropped a counter - info Requests dropped Number of times an HTTP/2 stream was refused because the queue was too long already. See also parameter thread_queue_limit. req_reset a counter - info Requests reset Number of times a client left before the VCL processing of its requests completed. For HTTP/2 sessions, either the stream was reset by an RST_STREAM frame from the client, or a stream or connection error oc- curred. n_object a gauge - info object structs made Approximate number of HTTP objects (headers + body, if present) in the cache. n_vampireobject a gauge - diag unresurrected objects Number of unresurrected objects n_objectcore a gauge - info objectcore structs made Approximate number of object metadata elements in the cache. Each object needs an objectcore, extra objectcores are for hit-for-miss, hit-for-pass and busy objects. n_objecthead a gauge - info objecthead structs made Approximate number of different hash entries in the cache. n_backend a gauge - info Number of backends Number of backends known to us. n_expired a counter - info Number of expired objects Number of objects that expired from cache because of old age. n_superseded a counter - diag Number of superseded objects Number of times an object was superseded by a new one. n_lru_nuked a counter - info Number of LRU nuked objects How many objects have been forcefully evicted from storage to make room for a new object. n_lru_moved a counter - diag Number of LRU moved objects Number of move operations done on the LRU list. n_lru_limited a counter - info Reached nuke_limit Number of times more storage space were needed, but limit was reached in a nuke_limit. See also parameter nuke_limit. losthdr a counter - info HTTP header overflows s_sess a counter - info Total sessions seen n_pipe a gauge - info Number of ongoing pipe sessions pipe_limited a counter - info Pipes hit pipe_sess_max Number of times more pipes were needed, but the limit was reached. See also parameter pipe_sess_max. s_pipe a counter - info Total pipe sessions seen s_pass a counter - info Total pass-ed requests seen s_fetch a counter - info Total backend fetches initiated Total backend fetches initiated, including background fetches. s_bgfetch a counter - info Total backend background fetches initiated s_synth a counter - info Total synthetic responses made s_req_hdrbytes a counter - info Request header bytes Total request header bytes received s_req_bodybytes a counter - info Request body bytes Total request body bytes received s_resp_hdrbytes a counter - info Response header bytes Total response header bytes transmitted s_resp_bodybytes a counter - info Response body bytes Total response body bytes transmitted s_pipe_hdrbytes a counter - info Pipe request header bytes Total request bytes received for piped sessions s_pipe_in a counter - info Piped bytes from client Total number of bytes forwarded from clients in pipe sessions s_pipe_out a counter - info Piped bytes to client Total number of bytes forwarded to clients in pipe sessions sess_closed a counter - info Session Closed sess_closed_err a counter - info Session Closed with error Total number of sessions closed with errors. See sc_* diag counters for detailed breakdown sess_readahead a counter - info Session Read Ahead sess_herd a counter - diag Session herd Number of times the timeout_linger triggered sc_rem_close a counter - diag Session OK REM_CLOSE Number of session closes with REM_CLOSE (Client Closed) sc_req_close a counter - diag Session OK REQ_CLOSE Number of session closes with REQ_CLOSE (Client requested close) sc_req_http10 a counter - diag Session Err REQ_HTTP10 Number of session closes with Error REQ_HTTP10 (Proto < HTTP/1.1) sc_rx_bad a counter - diag Session Err RX_BAD Number of session closes with Error RX_BAD (Received bad req/resp) sc_rx_body a counter - diag Session Err RX_BODY Number of session closes with Error RX_BODY (Failure receiving req.body) sc_rx_junk a counter - diag Session Err RX_JUNK Number of session closes with Error RX_JUNK (Received junk data) sc_rx_overflow a counter - diag Session Err RX_OVERFLOW Number of session closes with Error RX_OVERFLOW (Received buffer over- flow) sc_rx_timeout a counter - diag Session Err RX_TIMEOUT Number of session closes with Error RX_TIMEOUT (Receive timeout) sc_rx_close_idle a counter - diag Session Err RX_CLOSE_IDLE Number of session closes with Error RX_CLOSE_IDLE: timeout_idle has been exceeded while waiting for a client request. sc_tx_pipe a counter - diag Session OK TX_PIPE Number of session closes with TX_PIPE (Piped transaction) sc_tx_error a counter - diag Session Err TX_ERROR Number of session closes with Error TX_ERROR (Error transaction) sc_tx_eof a counter - diag Session OK TX_EOF Number of session closes with TX_EOF (EOF transmission) sc_resp_close a counter - diag Session OK RESP_CLOSE Number of session closes with RESP_CLOSE (Backend/VCL requested close) sc_overload a counter - diag Session Err OVERLOAD Number of session closes with Error OVERLOAD (Out of some resource) sc_pipe_overflow a counter - diag Session Err PIPE_OVERFLOW Number of session closes with Error PIPE_OVERFLOW (Session pipe over- flow) sc_range_short a counter - diag Session Err RANGE_SHORT Number of session closes with Error RANGE_SHORT (Insufficient data for range) sc_req_http20 a counter - diag Session Err REQ_HTTP20 Number of session closes with Error REQ_HTTP20 (HTTP2 not accepted) sc_vcl_failure a counter - diag Session Err VCL_FAILURE Number of session closes with Error VCL_FAILURE (VCL failure) sc_rapid_reset a counter - diag Session Err RAPID_RESET Number of times we failed an http/2 session because it hit its config- ured limits for the number of permitted rapid stream resets. sc_bankrupt a counter - diag Session Err BANKRUPT Number of times we failed an http/2 session because all the streams were waiting for their windows to be credited when h2_window_timeout trig- gered. client_resp_500 a counter - diag Delivery failed due to insufficient workspace. Number of times we failed a response due to running out of workspace memory during delivery. ws_backend_overflow a counter - diag workspace_backend overflows Number of times we ran out of space in workspace_backend. ws_client_overflow a counter - diag workspace_client overflows Number of times we ran out of space in workspace_client. ws_thread_overflow a counter - diag workspace_thread overflows Number of times we ran out of space in workspace_thread. ws_session_overflow a counter - diag workspace_session overflows Number of times we ran out of space in workspace_session. shm_records a counter - diag SHM records Number of log records written to the shared memory log. shm_writes a counter - diag SHM writes Number of individual writes to the shared memory log. A single write may batch multiple records for buffered tasks. shm_flushes a counter - diag SHM flushes due to overflow Number of writes performed before the end of a buffered task because adding a record to a batch would exceed vsl_buffer. shm_cont a counter - diag SHM lock contention Number of times a write had to wait for the lock. shm_cycles a counter - diag SHM cycles through VSL space Number of times a write of log records would reach past the end of the shared memory log, cycling back to the beginning. shm_bytes a counter - diag SHM bytes Number of bytes written to the shared memory log. backend_req a counter - info Backend requests made n_vcl a gauge - info Number of loaded VCLs in total n_vcl_avail a gauge - diag Number of VCLs available n_vcl_discard a gauge - diag Number of discarded VCLs vcl_fail a counter - info VCL failures Count of failures which prevented VCL from completing. bans a gauge - info Count of bans Number of all bans in system, including bans superseded by newer bans and bans already checked by the ban-lurker. bans_completed a gauge - diag Number of bans marked 'completed' Number of bans which are no longer active, either because they got checked by the ban-lurker or superseded by newer identical bans. bans_obj a gauge - diag Number of bans using obj.* Number of bans which use obj.* variables. These bans can possibly be washed by the ban-lurker. bans_req a gauge - diag Number of bans using req.* Number of bans which use req.* variables. These bans cannot be washed by the ban-lurker. bans_added a counter - diag Bans added Counter of bans added to ban list. bans_deleted a counter - diag Bans deleted Counter of bans deleted from ban list. bans_tested a counter - diag Bans tested against objects (lookup) Count of how many bans and objects have been tested against each other during hash lookup. bans_obj_killed a counter - diag Objects killed by bans (lookup) Number of objects killed by bans during object lookup. bans_lurker_tested a counter - diag Bans tested against objects (lurker) Count of how many bans and objects have been tested against each other by the ban-lurker. bans_tests_tested a counter - diag Ban tests tested against objects (lookup) Count of how many tests and objects have been tested against each other during lookup. 'ban req.url == foo && req.http.host == bar' counts as one in 'bans_tested' and as two in 'bans_tests_tested' bans_lurker_tests_tested a counter - diag Ban tests tested against objects (lurker) Count of how many tests and objects have been tested against each other by the ban-lurker. 'ban req.url == foo && req.http.host == bar' counts as one in 'bans_tested' and as two in 'bans_tests_tested' bans_lurker_obj_killed a counter - diag Objects killed by bans (lurker) Number of objects killed by the ban-lurker. bans_lurker_obj_killed_cutoff a counter - diag Objects killed by bans for cutoff (lurker) Number of objects killed by the ban-lurker to keep the number of bans below ban_cutoff. bans_dups a counter - diag Bans superseded by other bans Count of bans replaced by later identical bans. bans_lurker_contention a counter - diag Lurker gave way for lookup Number of times the ban-lurker had to wait for lookups. bans_persisted_bytes a gauge - diag Bytes used by the persisted ban lists Number of bytes used by the persisted ban lists. bans_persisted_fragmentation a gauge - diag Extra bytes in persisted ban lists due to fragmentation Number of extra bytes accumulated through dropped and completed bans in the persistent ban lists. n_purges a counter - info Number of purge operations executed n_obj_purged a counter - info Number of purged objects exp_mailed a counter - diag Number of objects mailed to expiry thread Number of objects mailed to expiry thread for handling. exp_received a counter - diag Number of objects received by expiry thread Number of objects received by expiry thread for handling. hcb_nolock a counter - debug HCB Lookups without lock hcb_lock a counter - debug HCB Lookups with lock hcb_insert a counter - debug HCB Inserts esi_errors a counter - diag ESI parse errors (unlock) esi_warnings a counter - diag ESI parse warnings (unlock) vmods a gauge - info Loaded VMODs n_gzip a counter - info Gzip operations n_gunzip a counter - info Gunzip operations n_test_gunzip a counter - info Test gunzip operations Those operations occur when Varnish receives a compressed object from a backend. They are done to verify the gzip stream while it's inserted in storage. http1_iovs_flush a counter - info Premature iovec flushes Number of additional writes performed on HTTP1 connections because the number of IO vectors was too small to submit all possible IO in one go. This number is configured through the http1_iovs parameter for client connections and implicitly defined by the amount of free workspace for backend connections. a MEMORY POOL COUNTERS live a gauge - debug In use pool a gauge - debug In Pool sz_wanted a gauge - debug Size requested sz_actual a gauge - debug Size allocated allocs a counter - debug Allocations frees a counter - debug Frees recycle a counter - debug Recycled from pool timeout a counter - debug Timed out from pool toosmall a counter - debug Too small to recycle surplus a counter - debug Too many for pool randry a counter - debug Pool ran dry a MANAGEMENT PROCESS COUNTERS uptime a counter - info Management process uptime Uptime in seconds of the management process child_start a counter - diag Child process started Number of times the child process has been started child_exit a counter - diag Child process normal exit Number of times the child process has been cleanly stopped child_stop a counter - diag Child process unexpected exit Number of times the child process has exited with an unexpected return code child_died a counter - diag Child process died (signal) Number of times the child process has died due to signals child_dump a counter - diag Child process core dumped Number of times the child process has produced core dumps child_panic a counter - diag Child process panic Number of times the management process has caught a child panic a MALLOC STEVEDORE COUNTERS c_req a counter - info Allocator requests Number of times the storage has been asked to provide a storage segment. c_fail a counter - info Allocator failures Number of times the storage has failed to provide a storage segment. c_bytes a counter - info Bytes allocated Number of total bytes allocated by this storage. c_freed a counter - info Bytes freed Number of total bytes returned to this storage. g_alloc a gauge - info Allocations outstanding Number of storage allocations outstanding. g_bytes a gauge - info Bytes outstanding Number of bytes allocated from the storage. g_space a gauge - info Bytes available Number of bytes left in the storage. a FILE STEVEDORE COUNTERS c_req a counter - info Allocator requests Number of times the storage has been asked to provide a storage segment. c_fail a counter - info Allocator failures Number of times the storage has failed to provide a storage segment. c_bytes a counter - info Bytes allocated Number of total bytes allocated by this storage. c_freed a counter - info Bytes freed Number of total bytes returned to this storage. g_alloc a gauge - info Allocations outstanding Number of storage allocations outstanding. g_bytes a gauge - info Bytes outstanding Number of bytes allocated from the storage. g_space a gauge - info Bytes available Number of bytes left in the storage. g_smf a gauge - info N struct smf g_smf_frag a gauge - info N small free smf g_smf_large a gauge - info N large free smf a UMEM STEVEDORE COUNTERS c_req a counter - info Allocator requests Number of times the storage has been asked to provide a storage segment. c_fail a counter - info Allocator failures Number of times the storage has failed to provide a storage segment. c_bytes a counter - info Bytes allocated Number of total bytes allocated by this storage. c_freed a counter - info Bytes freed Number of total bytes returned to this storage. g_alloc a gauge - info Allocations outstanding Number of storage allocations outstanding. g_bytes a gauge - info Bytes outstanding Number of bytes allocated from the storage. g_space a gauge - info Bytes available Number of bytes left in the storage. a BACKEND COUNTERS happy a bitmap - info Happy health probes Represents the last probe results as a bitmap. Happy probes are bits set to 1, and the unhappy ones are set to 0. The highest bits represent the oldest probes. bereq_hdrbytes a counter - info Request header bytes Total backend request header bytes sent bereq_bodybytes a counter - info Request body bytes Total backend request body bytes sent beresp_hdrbytes a counter - info Response header bytes Total backend response header bytes received beresp_bodybytes a counter - info Response body bytes Total backend response body bytes received pipe_hdrbytes a counter - info Pipe request header bytes Total request bytes sent for piped sessions pipe_out a counter - info Piped bytes to backend Total number of bytes forwarded to backend in pipe sessions pipe_in a counter - info Piped bytes from backend Total number of bytes forwarded from backend in pipe sessions conn a gauge - info Concurrent connections used The number of currently used connections to the backend. This number is always less or equal to the number of connections to the backend (as, for example shown as ESTABLISHED for TCP connections in netstat) due to connection pooling. req a counter - info Backend requests sent unhealthy a counter - info Fetches not attempted due to backend being unhealthy busy a counter - info Fetches not attempted due to backend being busy Number of times the max_connections limit was reached fail a counter - info Connections failed Counter of failed opens. Detailed reasons are given in the fail_* coun- ters (DIAG level) and in the log under the FetchError tag. This counter is the sum of all detailed fail_* counters. All fail_* counters may be slightly inaccurate for efficiency. fail_eacces a counter - diag Connections failed with EACCES or EPERM fail_eaddrnotavail a counter - diag Connections failed with EADDRNOTAVAIL fail_econnrefused a counter - diag Connections failed with ECONNREFUSED fail_enetunreach a counter - diag Connections failed with ENETUNREACH fail_etimedout a counter - diag Connections failed ETIMEDOUT fail_other a counter - diag Connections failed for other reason helddown a counter - diag Connection opens not attempted Connections not attempted during the backend_local_error_holddown or backend_remote_error_holddown interval after a fundamental connection issue. a WAITER COUNTERS conns a gauge - debug Number of idle connections Number of idle connections being waited over. remclose a counter - debug Number of idle connections closed by peer Number of idle connections that experienced closure by peer while being waited for. timeout a counter - debug Number of idle connections timeout Number of idle connections that experienced a timeout event while being waited for. action a counter - debug Number of idle connections read events Number of idle connections that experienced a read event while being waited for. AUTHORS This man page was written by Lasse Karstensen, using content from vsc2rst written by Tollef Fog Heen. VARNISH-COUNTERS(7)
NAME | a LOCK COUNTERS | a MAIN COUNTERS | a MEMORY POOL COUNTERS | a MANAGEMENT PROCESS COUNTERS | a MALLOC STEVEDORE COUNTERS | a FILE STEVEDORE COUNTERS | a UMEM STEVEDORE COUNTERS | a BACKEND COUNTERS | a WAITER COUNTERS | AUTHORS
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