1VARNISH-COUNTERS(7) VARNISH-COUNTERS(7)
2
6 varnish-counters - Varnish counter field definitions
7
9 summs – counter - debug
10 stat summ operations
11 Number of times per-thread statistics were summed into the global
13 counters.
14 uptime – counter - info
16 Child process uptime
17 How long the child process has been running.
19 sess_conn – counter - info
21 Sessions accepted
22 Count of sessions successfully accepted
24 sess_fail – counter - info
26 Session accept failures
27 Count of failures to accept TCP connection.
29 This counter is the sum of the sess_fail_* counters, which give more
31 detailed information.
32 sess_fail_econnaborted – counter - info
34 Session accept failures: connection aborted
35 Detailed reason for sess_fail: Connection aborted by the client,
37 usually harmless.
38 sess_fail_eintr – counter - info
40 Session accept failures: interrupted system call
41 Detailed reason for sess_fail: The accept() call was interrupted,
43 usually harmless
44 sess_fail_emfile – counter - info
46 Session accept failures: too many open files
47 Detailed reason for sess_fail: No file descriptor was available.
49 Consider raising RLIMIT_NOFILE (see ulimit -n).
50 sess_fail_ebadf – counter - info
52 Session accept failures: bad file descriptor
53 Detailed reason for sess_fail: The listen socket file descriptor was
55 invalid. Should never happen.
56 sess_fail_enomem – counter - info
58 Session accept failures: not enough memory
59 Detailed reason for sess_fail: Most likely insufficient socket buf‐
61 fer memory. Should never happen
62 sess_fail_other – counter - info
64 Session accept failures: other
65 Detailed reason for sess_fail: neither of the above, see SessError
67 log (varnishlog -g raw -i SessError).
68 client_req_400 – counter - info
70 Client requests received, subject to 400 errors
71 400 means we couldn't make sense of the request, it was malformed in
73 some drastic way.
74 client_req_417 – counter - info
76 Client requests received, subject to 417 errors
77 417 means that something went wrong with an Expect: header.
79 client_req – counter - info
81 Good client requests received
82 The count of parseable client requests seen.
84 esi_req – counter - info
86 ESI subrequests
87 Number of ESI subrequests made.
89 cache_hit – counter - info
91 Cache hits
92 Count of cache hits. A cache hit indicates that an object has been
94 delivered to a client without fetching it from a backend server.
95 cache_hit_grace – counter - info
97 Cache grace hits
98 Count of cache hits with grace. A cache hit with grace is a cache
100 hit where the object is expired. Note that such hits are also in‐
101 cluded in the cache_hit counter.
102 cache_hitpass – counter - info
104 Cache hits for pass.
105 Count of hits for pass. A cache hit for pass indicates that Varnish
107 is going to pass the request to the backend and this decision has
108 been cached in it self. This counts how many times the cached deci‐
109 sion is being used.
110 cache_hitmiss – counter - info
112 Cache hits for miss.
113 Count of hits for miss. A cache hit for miss indicates that Varnish
115 is going to proceed as for a cache miss without request coalescing,
116 and this decision has been cached. This counts how many times the
117 cached decision is being used.
118 cache_miss – counter - info
120 Cache misses
121 Count of misses. A cache miss indicates the object was fetched from
123 the backend before delivering it to the client.
124 beresp_uncacheable – counter - info
126 Uncacheable backend responses
127 Count of backend responses considered uncacheable.
129 beresp_shortlived – counter - info
131 Shortlived objects
132 Count of objects created with ttl+grace+keep shorter than the
134 'shortlived' runtime parameter.
135 backend_conn – counter - info
137 Backend conn. success
138 How many backend connections have successfully been established.
140 backend_unhealthy – counter - info
142 Backend conn. not attempted
143 backend_busy – counter - info
145 Backend conn. too many
146 backend_fail – counter - info
148 Backend conn. failures
149 backend_reuse – counter - info
151 Backend conn. reuses
152 Count of backend connection reuses. This counter is increased when‐
154 ever we reuse a recycled connection.
155 backend_recycle – counter - info
157 Backend conn. recycles
158 Count of backend connection recycles. This counter is increased
160 whenever we have a keep-alive connection that is put back into the
161 pool of connections. It has not yet been used, but it might be, un‐
162 less the backend closes it.
163 backend_retry – counter - info
165 Backend conn. retry
166 fetch_head – counter - info
168 Fetch no body (HEAD)
169 beresp with no body because the request is HEAD.
171 fetch_length – counter - info
173 Fetch with Length
174 beresp.body with Content-Length.
176 fetch_chunked – counter - info
178 Fetch chunked
179 beresp.body with Chunked.
181 fetch_eof – counter - info
183 Fetch EOF
184 beresp.body with EOF.
186 fetch_bad – counter - info
188 Fetch bad T-E
189 beresp.body length/fetch could not be determined.
191 fetch_none – counter - info
193 Fetch no body
194 beresp.body empty
196 fetch_1xx – counter - info
198 Fetch no body (1xx)
199 beresp with no body because of 1XX response.
201 fetch_204 – counter - info
203 Fetch no body (204)
204 beresp with no body because of 204 response.
206 fetch_304 – counter - info
208 Fetch no body (304)
209 beresp with no body because of 304 response.
211 fetch_failed – counter - info
213 Fetch failed (all causes)
214 beresp fetch failed.
216 fetch_no_thread – counter - info
218 Fetch failed (no thread)
219 beresp fetch failed, no thread available.
221 pools – gauge - info
223 Number of thread pools
224 Number of thread pools. See also parameter thread_pools. NB: Pres‐
226 ently pools cannot be removed once created.
227 threads – gauge - info
229 Total number of threads
230 Number of threads in all pools. See also parameters thread_pools,
232 thread_pool_min and thread_pool_max.
233 threads_limited – counter - info
235 Threads hit max
236 Number of times more threads were needed, but limit was reached in a
238 thread pool. See also parameter thread_pool_max.
239 threads_created – counter - info
241 Threads created
242 Total number of threads created in all pools.
244 threads_destroyed – counter - info
246 Threads destroyed
247 Total number of threads destroyed in all pools.
249 threads_failed – counter - info
251 Thread creation failed
252 Number of times creating a thread failed. See VSL::Debug for diag‐
254 nostics. See also parameter thread_fail_delay.
255 thread_queue_len – gauge - info
257 Length of session queue
258 Length of session queue waiting for threads. NB: Only updates once
260 per second. See also parameter thread_queue_limit.
261 busy_sleep – counter - info
263 Number of requests sent to sleep on busy objhdr
264 Number of requests sent to sleep without a worker thread because
266 they found a busy object.
267 busy_wakeup – counter - info
269 Number of requests woken after sleep on busy objhdr
270 Number of requests taken off the busy object sleep list and resched‐
272 uled.
273 busy_killed – counter - info
275 Number of requests killed after sleep on busy objhdr
276 Number of requests killed from the busy object sleep list due to
278 lack of resources.
279 sess_queued – counter - info
281 Sessions queued for thread
282 Number of times session was queued waiting for a thread. See also
284 parameter thread_queue_limit.
285 sess_dropped – counter - info
287 Sessions dropped for thread
288 Number of times an HTTP/1 session was dropped because the queue was
290 too long already. See also parameter thread_queue_limit.
291 req_dropped – counter - info
293 Requests dropped
294 Number of times an HTTP/2 stream was refused because the queue was
296 too long already. See also parameter thread_queue_limit.
297 n_object – gauge - info
299 object structs made
300 Approximate number of HTTP objects (headers + body, if present) in
302 the cache.
303 n_vampireobject – gauge - diag
305 unresurrected objects
306 Number of unresurrected objects
308 n_objectcore – gauge - info
310 objectcore structs made
311 Approximate number of object metadata elements in the cache. Each
313 object needs an objectcore, extra objectcores are for hit-for-miss,
314 hit-for-pass and busy objects.
315 n_objecthead – gauge - info
317 objecthead structs made
318 Approximate number of different hash entries in the cache.
320 n_backend – gauge - info
322 Number of backends
323 Number of backends known to us.
325 n_expired – counter - info
327 Number of expired objects
328 Number of objects that expired from cache because of old age.
330 n_lru_nuked – counter - info
332 Number of LRU nuked objects
333 How many objects have been forcefully evicted from storage to make
335 room for a new object.
336 n_lru_moved – counter - diag
338 Number of LRU moved objects
339 Number of move operations done on the LRU list.
341 n_lru_limited – counter - info
343 Reached nuke_limit
344 Number of times more storage space were needed, but limit was
346 reached in a nuke_limit. See also parameter nuke_limit.
347 losthdr – counter - info
349 HTTP header overflows
350 s_sess – counter - info
352 Total sessions seen
353 n_pipe – gauge - info
355 Number of ongoing pipe sessions
356 pipe_limited – counter - info
358 Pipes hit pipe_sess_max
359 Number of times more pipes were needed, but the limit was reached.
361 See also parameter pipe_sess_max.
362 s_pipe – counter - info
364 Total pipe sessions seen
365 s_pass – counter - info
367 Total pass-ed requests seen
368 s_fetch – counter - info
370 Total backend fetches initiated
371 Total backend fetches initiated, including background fetches.
373 s_bgfetch – counter - info
375 Total backend background fetches initiated
376 s_synth – counter - info
378 Total synthetic responses made
379 s_req_hdrbytes – counter - info
381 Request header bytes
382 Total request header bytes received
384 s_req_bodybytes – counter - info
386 Request body bytes
387 Total request body bytes received
389 s_resp_hdrbytes – counter - info
391 Response header bytes
392 Total response header bytes transmitted
394 s_resp_bodybytes – counter - info
396 Response body bytes
397 Total response body bytes transmitted
399 s_pipe_hdrbytes – counter - info
401 Pipe request header bytes
402 Total request bytes received for piped sessions
404 s_pipe_in – counter - info
406 Piped bytes from client
407 Total number of bytes forwarded from clients in pipe sessions
409 s_pipe_out – counter - info
411 Piped bytes to client
412 Total number of bytes forwarded to clients in pipe sessions
414 sess_closed – counter - info
416 Session Closed
417 sess_closed_err – counter - info
419 Session Closed with error
420 Total number of sessions closed with errors. See sc_* diag counters
422 for detailed breakdown
423 sess_readahead – counter - info
425 Session Read Ahead
426 sess_herd – counter - diag
428 Session herd
429 Number of times the timeout_linger triggered
431 sc_rem_close – counter - diag
433 Session OK REM_CLOSE
434 Number of session closes with REM_CLOSE (Client Closed)
436 sc_req_close – counter - diag
438 Session OK REQ_CLOSE
439 Number of session closes with REQ_CLOSE (Client requested close)
441 sc_req_http10 – counter - diag
443 Session Err REQ_HTTP10
444 Number of session closes with Error REQ_HTTP10 (Proto < HTTP/1.1)
446 sc_rx_bad – counter - diag
448 Session Err RX_BAD
449 Number of session closes with Error RX_BAD (Received bad req/resp)
451 sc_rx_body – counter - diag
453 Session Err RX_BODY
454 Number of session closes with Error RX_BODY (Failure receiving
456 req.body)
457 sc_rx_junk – counter - diag
459 Session Err RX_JUNK
460 Number of session closes with Error RX_JUNK (Received junk data)
462 sc_rx_overflow – counter - diag
464 Session Err RX_OVERFLOW
465 Number of session closes with Error RX_OVERFLOW (Received buffer
467 overflow)
468 sc_rx_timeout – counter - diag
470 Session Err RX_TIMEOUT
471 Number of session closes with Error RX_TIMEOUT (Receive timeout)
473 sc_rx_close_idle – counter - diag
475 Session Err RX_CLOSE_IDLE
476 Number of session closes with Error RX_CLOSE_IDLE: timeout_idle has
478 been exceeded while waiting for a client request.
479 sc_tx_pipe – counter - diag
481 Session OK TX_PIPE
482 Number of session closes with TX_PIPE (Piped transaction)
484 sc_tx_error – counter - diag
486 Session Err TX_ERROR
487 Number of session closes with Error TX_ERROR (Error transaction)
489 sc_tx_eof – counter - diag
491 Session OK TX_EOF
492 Number of session closes with TX_EOF (EOF transmission)
494 sc_resp_close – counter - diag
496 Session OK RESP_CLOSE
497 Number of session closes with RESP_CLOSE (Backend/VCL requested
499 close)
500 sc_overload – counter - diag
502 Session Err OVERLOAD
503 Number of session closes with Error OVERLOAD (Out of some resource)
505 sc_pipe_overflow – counter - diag
507 Session Err PIPE_OVERFLOW
508 Number of session closes with Error PIPE_OVERFLOW (Session pipe
510 overflow)
511 sc_range_short – counter - diag
513 Session Err RANGE_SHORT
514 Number of session closes with Error RANGE_SHORT (Insufficient data
516 for range)
517 sc_req_http20 – counter - diag
519 Session Err REQ_HTTP20
520 Number of session closes with Error REQ_HTTP20 (HTTP2 not accepted)
522 sc_vcl_failure – counter - diag
524 Session Err VCL_FAILURE
525 Number of session closes with Error VCL_FAILURE (VCL failure)
527 client_resp_500 – counter - diag
529 Delivery failed due to insufficient workspace.
530 Number of times we failed a response due to running out of workspace
532 memory during delivery.
533 ws_backend_overflow – counter - diag
535 workspace_backend overflows
536 Number of times we ran out of space in workspace_backend.
538 ws_client_overflow – counter - diag
540 workspace_client overflows
541 Number of times we ran out of space in workspace_client.
543 ws_thread_overflow – counter - diag
545 workspace_thread overflows
546 Number of times we ran out of space in workspace_thread.
548 ws_session_overflow – counter - diag
550 workspace_session overflows
551 Number of times we ran out of space in workspace_session.
553 shm_records – counter - diag
555 SHM records
556 shm_writes – counter - diag
558 SHM writes
559 shm_flushes – counter - diag
561 SHM flushes due to overflow
562 shm_cont – counter - diag
564 SHM MTX contention
565 shm_cycles – counter - diag
567 SHM cycles through buffer
568 backend_req – counter - info
570 Backend requests made
571 n_vcl – gauge - info
573 Number of loaded VCLs in total
574 n_vcl_avail – gauge - diag
576 Number of VCLs available
577 n_vcl_discard – gauge - diag
579 Number of discarded VCLs
580 vcl_fail – counter - info
582 VCL failures
583 Count of failures which prevented VCL from completing.
585 bans – gauge - info
587 Count of bans
588 Number of all bans in system, including bans superseded by newer
590 bans and bans already checked by the ban-lurker.
591 bans_completed – gauge - diag
593 Number of bans marked 'completed'
594 Number of bans which are no longer active, either because they got
596 checked by the ban-lurker or superseded by newer identical bans.
597 bans_obj – gauge - diag
599 Number of bans using obj.*
600 Number of bans which use obj.* variables. These bans can possibly
602 be washed by the ban-lurker.
603 bans_req – gauge - diag
605 Number of bans using req.*
606 Number of bans which use req.* variables. These bans can not be
608 washed by the ban-lurker.
609 bans_added – counter - diag
611 Bans added
612 Counter of bans added to ban list.
614 bans_deleted – counter - diag
616 Bans deleted
617 Counter of bans deleted from ban list.
619 bans_tested – counter - diag
621 Bans tested against objects (lookup)
622 Count of how many bans and objects have been tested against each
624 other during hash lookup.
625 bans_obj_killed – counter - diag
627 Objects killed by bans (lookup)
628 Number of objects killed by bans during object lookup.
630 bans_lurker_tested – counter - diag
632 Bans tested against objects (lurker)
633 Count of how many bans and objects have been tested against each
635 other by the ban-lurker.
636 bans_tests_tested – counter - diag
638 Ban tests tested against objects (lookup)
639 Count of how many tests and objects have been tested against each
641 other during lookup. 'ban req.url == foo && req.http.host == bar'
642 counts as one in 'bans_tested' and as two in 'bans_tests_tested'
643 bans_lurker_tests_tested – counter - diag
645 Ban tests tested against objects (lurker)
646 Count of how many tests and objects have been tested against each
648 other by the ban-lurker. 'ban req.url == foo && req.http.host ==
649 bar' counts as one in 'bans_tested' and as two in
650 'bans_tests_tested'
651 bans_lurker_obj_killed – counter - diag
653 Objects killed by bans (lurker)
654 Number of objects killed by the ban-lurker.
656 bans_lurker_obj_killed_cutoff – counter - diag
658 Objects killed by bans for cutoff (lurker)
659 Number of objects killed by the ban-lurker to keep the number of
661 bans below ban_cutoff.
662 bans_dups – counter - diag
664 Bans superseded by other bans
665 Count of bans replaced by later identical bans.
667 bans_lurker_contention – counter - diag
669 Lurker gave way for lookup
670 Number of times the ban-lurker had to wait for lookups.
672 bans_persisted_bytes – gauge - diag
674 Bytes used by the persisted ban lists
675 Number of bytes used by the persisted ban lists.
677 bans_persisted_fragmentation – gauge - diag
679 Extra bytes in persisted ban lists due to fragmentation
680 Number of extra bytes accumulated through dropped and completed bans
682 in the persistent ban lists.
683 n_purges – counter - info
685 Number of purge operations executed
686 n_obj_purged – counter - info
688 Number of purged objects
689 exp_mailed – counter - diag
691 Number of objects mailed to expiry thread
692 Number of objects mailed to expiry thread for handling.
694 exp_received – counter - diag
696 Number of objects received by expiry thread
697 Number of objects received by expiry thread for handling.
699 hcb_nolock – counter - debug
701 HCB Lookups without lock
702 hcb_lock – counter - debug
704 HCB Lookups with lock
705 hcb_insert – counter - debug
707 HCB Inserts
708 esi_errors – counter - diag
710 ESI parse errors (unlock)
711 esi_warnings – counter - diag
713 ESI parse warnings (unlock)
714 vmods – gauge - info
716 Loaded VMODs
717 n_gzip – counter - info
719 Gzip operations
720 n_gunzip – counter - info
722 Gunzip operations
723 n_test_gunzip – counter - info
725 Test gunzip operations
726 Those operations occur when Varnish receives a compressed object
728 from a backend. They are done to verify the gzip stream while it's
729 inserted in storage.
730
732 uptime – counter - info
733 Management process uptime
734 Uptime in seconds of the management process
736 child_start – counter - diag
738 Child process started
739 Number of times the child process has been started
741 child_exit – counter - diag
743 Child process normal exit
744 Number of times the child process has been cleanly stopped
746 child_stop – counter - diag
748 Child process unexpected exit
749 Number of times the child process has exited with an unexpected re‐
751 turn code
752 child_died – counter - diag
754 Child process died (signal)
755 Number of times the child process has died due to signals
757 child_dump – counter - diag
759 Child process core dumped
760 Number of times the child process has produced core dumps
762 child_panic – counter - diag
764 Child process panic
765 Number of times the management process has caught a child panic
767
769 live – gauge - debug
770 In use
771 pool – gauge - debug
773 In Pool
774 sz_wanted – gauge - debug
776 Size requested
777 sz_actual – gauge - debug
779 Size allocated
780 allocs – counter - debug
782 Allocations
783 frees – counter - debug
785 Frees
786 recycle – counter - debug
788 Recycled from pool
789 timeout – counter - debug
791 Timed out from pool
792 toosmall – counter - debug
794 Too small to recycle
795 surplus – counter - debug
797 Too many for pool
798 randry – counter - debug
800 Pool ran dry
801
803 c_req – counter - info
804 Allocator requests
805 Number of times the storage has been asked to provide a storage seg‐
807 ment.
808 c_fail – counter - info
810 Allocator failures
811 Number of times the storage has failed to provide a storage segment.
813 c_bytes – counter - info
815 Bytes allocated
816 Number of total bytes allocated by this storage.
818 c_freed – counter - info
820 Bytes freed
821 Number of total bytes returned to this storage.
823 g_alloc – gauge - info
825 Allocations outstanding
826 Number of storage allocations outstanding.
828 g_bytes – gauge - info
830 Bytes outstanding
831 Number of bytes allocated from the storage.
833 g_space – gauge - info
835 Bytes available
836 Number of bytes left in the storage.
838
840 c_req – counter - info
841 Allocator requests
842 Number of times the storage has been asked to provide a storage seg‐
844 ment.
845 c_fail – counter - info
847 Allocator failures
848 Number of times the storage has failed to provide a storage segment.
850 c_bytes – counter - info
852 Bytes allocated
853 Number of total bytes allocated by this storage.
855 c_freed – counter - info
857 Bytes freed
858 Number of total bytes returned to this storage.
860 g_alloc – gauge - info
862 Allocations outstanding
863 Number of storage allocations outstanding.
865 g_bytes – gauge - info
867 Bytes outstanding
868 Number of bytes allocated from the storage.
870 g_space – gauge - info
872 Bytes available
873 Number of bytes left in the storage.
875
877 c_req – counter - info
878 Allocator requests
879 Number of times the storage has been asked to provide a storage seg‐
881 ment.
882 c_fail – counter - info
884 Allocator failures
885 Number of times the storage has failed to provide a storage segment.
887 c_bytes – counter - info
889 Bytes allocated
890 Number of total bytes allocated by this storage.
892 c_freed – counter - info
894 Bytes freed
895 Number of total bytes returned to this storage.
897 g_alloc – gauge - info
899 Allocations outstanding
900 Number of storage allocations outstanding.
902 g_bytes – gauge - info
904 Bytes outstanding
905 Number of bytes allocated from the storage.
907 g_space – gauge - info
909 Bytes available
910 Number of bytes left in the storage.
912 g_smf – gauge - info
914 N struct smf
915 g_smf_frag – gauge - info
917 N small free smf
918 g_smf_large – gauge - info
920 N large free smf
921
923 happy – bitmap - info
924 Happy health probes
925 Represents the last probe results as a bitmap. Happy probes are bits
927 set to 1, and the unhappy ones are set to 0. The highest bits repre‐
928 sent the oldest probes.
929 bereq_hdrbytes – counter - info
931 Request header bytes
932 Total backend request header bytes sent
934 bereq_bodybytes – counter - info
936 Request body bytes
937 Total backend request body bytes sent
939 beresp_hdrbytes – counter - info
941 Response header bytes
942 Total backend response header bytes received
944 beresp_bodybytes – counter - info
946 Response body bytes
947 Total backend response body bytes received
949 pipe_hdrbytes – counter - info
951 Pipe request header bytes
952 Total request bytes sent for piped sessions
954 pipe_out – counter - info
956 Piped bytes to backend
957 Total number of bytes forwarded to backend in pipe sessions
959 pipe_in – counter - info
961 Piped bytes from backend
962 Total number of bytes forwarded from backend in pipe sessions
964 conn – gauge - info
966 Concurrent connections used
967 The number of currently used connections to the backend. This number
969 is always less or equal to the number of connections to the backend
970 (as, for example shown as ESTABLISHED for TCP connections in net‐
971 stat) due to connection pooling.
972 req – counter - info
974 Backend requests sent
975 unhealthy – counter - info
977 Fetches not attempted due to backend being unhealthy
978 busy – counter - info
980 Fetches not attempted due to backend being busy
981 Number of times the max_connections limit was reached
983 fail – counter - info
985 Connections failed
986 Counter of failed opens. Detailed reasons are given in the fail_*
988 counters (DIAG level) and in the log under the FetchError tag.
989 This counter is the sum of all detailed fail_* counters.
991 All fail_* counters may be slightly inaccurate for efficiency.
993 fail_eacces – counter - diag
995 Connections failed with EACCES or EPERM
996 fail_eaddrnotavail – counter - diag
998 Connections failed with EADDRNOTAVAIL
999 fail_econnrefused – counter - diag
1001 Connections failed with ECONNREFUSED
1002 fail_enetunreach – counter - diag
1004 Connections failed with ENETUNREACH
1005 fail_etimedout – counter - diag
1007 Connections failed ETIMEDOUT
1008 fail_other – counter - diag
1010 Connections failed for other reason
1011 helddown – counter - diag
1013 Connection opens not attempted
1014 Connections not attempted during the backend_local_error_holddown or
1016 backend_remote_error_holddown interval after a fundamental connec‐
1017 tion issue.
1018
1020 Counters which track the activity in the different classes of mu‐
1021 tex-locks.
1022 The counts may be slightly wrong if there are more than one lock in‐
1024 stantiated in each class (ie: .creat > 1)
1025 creat – counter - debug
1027 Created locks
1028 destroy – counter - debug
1030 Destroyed locks
1031 locks – counter - debug
1033 Lock Operations
1034 dbg_busy – counter - debug
1036 Contended lock operations
1037 If the lck debug bit is set: Lock operations which returned EBUSY on
1039 the first locking attempt.
1040 If the lck debug bit is unset, this counter will never be incre‐
1042 mented even if lock operations are contended.
1043 dbg_try_fail – counter - debug
1045 Contended trylock operations
1046 If the lck debug bit is set: Trylock operations which returned
1048 EBUSY.
1049 If the lck debug bit is unset, this counter will never be incre‐
1051 mented even if lock operations are contended.
1052
1054 This man page was written by Lasse Karstensen, using content from
1055 vsc2rst written by Tollef Fog Heen.
1056 VARNISH-COUNTERS(7)