= Gerrit Code Review - Metrics

Metrics about Gerrit's internal state can be sent to external monitoring systems
via plugins. See the link:dev-plugins.html#metrics[plugin documentation] for
details of plugin implementations.

== Metrics

The following metrics are reported.

=== General

* `build/label`: Version of Gerrit server software.
* `events`: Triggered events.

=== Actions

* `action/retry_attempt_count`: Number of retry attempts made
by RetryHelper to execute an action (0 == single attempt, no retry)
* `action/retry_timeout_count`: Number of action executions of RetryHelper
that ultimately timed out
* `action/auto_retry_count`: Number of automatic retries with tracing
* `action/failures_on_auto_retry_count`: Number of failures on auto retry

[[cancellations]]
=== Cancellations

* `cancellation/advisory_deadline_count`: Exceeded advisory deadlines by request
* `cancellation/cancelled_requests_count`: Number of request cancellations by
  request
* `cancellation/receive_timeout_count`: Number of requests that are cancelled
  because link:config.html#receive.timeout[receive.timout] is exceeded

=== Pushes

* `receivecommits/changes`: histogram of number of changes processed
in a single upload, split up by update type (change created/updated,
change autoclosed).
* `receivecommits/latency`: latency per change for processing a push,
split up by update type (create+replace, and autoclose)
* `receivecommits/push_latency`: total latency for processing a push,
split up by update type (create+replace, autoclose, normal)
* `receivecommits/timeout`: number of timeouts during push processing.

=== Process

* `proc/birth_timestamp`: Time at which the Gerrit process started.
* `proc/uptime`: Uptime of the Gerrit process.
* `proc/cpu/num_cores`: Number of processors available to the Java virtual machine.
* `proc/cpu/usage`: CPU time used by the Gerrit process.
* `proc/cpu/system_load`: System load average for the last minute.
* `proc/num_open_fds`: Number of open file descriptors.
* `proc/jvm/memory/heap_committed`: Amount of memory guaranteed for user objects.
* `proc/jvm/memory/heap_used`: Amount of memory holding user objects.
* `proc/jvm/memory/non_heap_committed`: Amount of memory guaranteed for classes,
etc.
* `proc/jvm/memory/non_heap_used`: Amount of memory holding classes, etc.
* `proc/jvm/memory/object_pending_finalization_count`: Approximate number of
objects needing finalization.
* `proc/jvm/gc/count`: Number of GCs.
* `proc/jvm/gc/time`: Approximate accumulated GC elapsed time.
* `proc/jvm/memory/pool/committed/<pool name>`: Committed amount of memory for pool.
* `proc/jvm/memory/pool/max/<pool name>`: Maximum amount of memory for pool.
* `proc/jvm/memory/pool/used/<pool name>`: Used amount of memory for pool.
* `proc/jvm/thread/num_live`: Current live thread count.
* `proc/jvm/thread/num_daemon_live`: Current live daemon threads count.
* `proc/jvm/thread/num_peak_live`: Peak live thread count since the Java virtual machine started or peak was reset.
* `proc/jvm/thread/num_total_started`: Total number of threads created and also started since the Java virtual machine started.
* `proc/jvm/thread/num_deadlocked_threads`: Number of threads that are deadlocked waiting for object monitors or ownable synchronizers.
   If deadlocks waiting for ownable synchronizers can be monitored depends on the capabilities of the used JVM.

=== Caches

* `caches/memory_cached`: Memory entries.
* `caches/memory_hit_ratio`: Memory hit ratio.
* `caches/memory_eviction_count`: Memory eviction count.
* `caches/disk_cached`: Disk entries used by persistent cache.
* `caches/disk_hit_ratio`: Disk hit ratio for persistent cache.
* `caches/refresh_count`: The number of refreshes per cache with an indicator if a reload was necessary.
* `caches/diff/timeouts`: The number of git file diff computations that resulted in timeouts.
* `caches/diff/legacy/timeouts`: The number of git file diff computations (using the legacy cache) that resulted in timeouts.

Cache disk metrics are expensive to compute on larger installations and are not
computed by default. They can be enabled via the
link:config.gerrit.html#cache.enableDiskStatMetrics[`cache.enableDiskStatMetrics`]
setting.

=== Change

* `change/submit_rule_evaluation`: Latency for evaluating submit rules on a change.
* `change/submit_type_evaluation`: Latency for evaluating the submit type on a change.
* `change/post_review/draft_handling`: Total number of draft handling option (KEEP, PUBLISH, PUBLISH_ALL_REVISIONS) selected by users while posting a review.

=== Comments

* `ported_comments/as_patchset_level`: Total number of comments ported as patchset-level comments.
* `ported_comments/as_file_level`: Total number of comments ported as file-level comments.
* `ported_comments/as_range_comments`: Total number of comments having line/range values in the ported patchset.

=== HTTP

==== Jetty

* `http/server/jetty/connections/connections`: The current number of open connections
* `http/server/jetty/connections/connections_total`: The total number of connections opened
* `http/server/jetty/connections/connections_duration_max`: The max duration of a connection in ms
* `http/server/jetty/connections/connections_duration_mean`: The mean duration of a connection in ms
* `http/server/jetty/connections/connections_duration_stdev`: The standard deviation of the duration of a connection in ms
* `http/server/jetty/connections/received_messages`: The total number of messages received
* `http/server/jetty/connections/sent_messages`: The total number of messages sent
* `http/server/jetty/connections/received_bytes`: Total number of bytes received by tracked connections
* `http/server/jetty/connections/sent_bytes`: Total number of bytes sent by tracked connections"
* `http/server/jetty/threadpool/active_threads`: Active threads
* `http/server/jetty/threadpool/idle_threads`: Idle threads
* `http/server/jetty/threadpool/reserved_threads`: Reserved threads
* `http/server/jetty/threadpool/max_pool_size`: Maximum thread pool size
* `http/server/jetty/threadpool/min_pool_size`: Minimum thread pool size
* `http/server/jetty/threadpool/pool_size`: Current thread pool size
* `http/server/jetty/threadpool/queue_size`: Queued requests waiting for a thread

==== LDAP

* `ldap/login_latency`: Latency of logins.
* `ldap/user_search_latency`: Latency for searching the user account.
* `ldap/group_search_latency`: Latency for querying the group memberships of an account.
* `ldap/group_expansion_latency`: Latency for expanding nested groups.

==== REST API

* `http/server/error_count`: Rate of REST API error responses.
* `http/server/success_count`: Rate of REST API success responses.
* `http/server/rest_api/count`: Rate of REST API calls by view.
* `http/server/rest_api/change_id_type`: Rate of REST API calls by change ID type.
* `http/server/rest_api/error_count`: Rate of REST API calls by view.
* `http/server/rest_api/server_latency`: REST API call latency by view.
* `http/server/rest_api/response_bytes`: Size of REST API response on network
(may be gzip compressed) by view.
* `http/server/rest_api/change_json/to_change_info_latency`: Latency for
toChangeInfo invocations in ChangeJson.
* `http/server/rest_api/change_json/to_change_infos_latency`: Latency for
toChangeInfos invocations in ChangeJson.
* `http/server/rest_api/change_json/format_query_results_latency`: Latency for
formatQueryResults invocations in ChangeJson.
* `http/server/rest_api/ui_actions/latency`: Latency for RestView#getDescription calls.

=== Query

* `query/query_latency`: Successful query latency, accumulated over the life
of the process.

=== Core Queues

The following queues support metrics:

* default `WorkQueue`
* index batch
* index interactive
* receive commits
* send email
* ssh batch worker
* ssh command start
* ssh interactive worker
* ssh stream worker

Each queue provides the following metrics:

* `queue/<queue_name>/pool_size`: Current number of threads in the pool
* `queue/<queue_name>/max_pool_size`: Maximum allowed number of threads in the pool
* `queue/<queue_name>/active_threads`: Number of threads that are actively executing tasks
* `queue/<queue_name>/scheduled_tasks`: Number of scheduled tasks in the queue
* `queue/<queue_name>/total_scheduled_tasks_count`: Total number of tasks that have been scheduled
* `queue/<queue_name>/total_completed_tasks_count`: Total number of tasks that have completed execution

=== SSH sessions

* `sshd/sessions/connected`: Number of currently connected SSH sessions.
* `sshd/sessions/created`: Rate of new SSH sessions.
* `sshd/sessions/authentication_failures`: Rate of SSH authentication failures.

=== Topics

* `topic/cross_project_submit`: number of cross-project topic submissions.
* `topic/cross_project_submit_completed`: number of cross-project
topic submissions that concluded successfully.

=== JGit

* `jgit/block_cache/cache_used` : Bytes of memory retained in JGit block cache.
* `jgit/block_cache/open_files` : File handles held open by JGit block cache.
* `avg_load_time` : Average time to load a cache entry for JGit block cache.
* `total_load_time` : Total time to load cache entries for JGit block cache.
* `eviction_count` : Cache evictions for JGit block cache.
* `eviction_ratio` : Cache eviction ratio for JGit block cache.
* `hit_count` : Cache hits for JGit block cache.
* `hit_ratio` : Cache hit ratio for JGit block cache.
* `load_failure_count` : Failed cache loads for JGit block cache.
* `load_failure_ratio` : Failed cache load ratio for JGit block cache.
* `load_success_count` : Successful cache loads for JGit block cache.
* `miss_count` : Cache misses for JGit block cache.
* `miss_ratio` : Cache miss ratio for JGit block cache.
* `cache_used_per_repository` : Bytes of memory retained per repository for the top N repositories
having most data in the cache. The number N of reported repositories is limited to 1000.

=== Git

* `git/upload-pack/request_count`: Total number of git-upload-pack requests.
* `git/upload-pack/phase_counting`: Time spent in the 'Counting...' phase.
* `git/upload-pack/phase_compressing`: Time spent in the 'Compressing...' phase.
* `git/upload-pack/phase_writing`: Time spent transferring bytes to client.
* `git/upload-pack/pack_bytes`: Distribution of sizes of packs sent to clients.
* `git/auto-merge/num_operations`: Number of auto merge operations and context.
* `git/auto-merge/latency`: Latency of auto merge operations and context.

=== BatchUpdate

* `batch_update/execute_change_ops`: BatchUpdate change update latency,
excluding reindexing

=== NoteDb

* `notedb/update_latency`: NoteDb update latency for changes.
* `notedb/stage_update_latency`: Latency for staging change updates to NoteDb.
* `notedb/read_latency`: NoteDb read latency for changes.
* `notedb/parse_latency`: NoteDb parse latency for changes.
* `notedb/external_id_cache_load_count`: Total number of times the external ID
  cache loader was called.
* `notedb/external_id_partial_read_latency`: Latency for generating a new external ID
  cache state from a prior state.
* `notedb/external_id_update_count`: Total number of external ID updates.
* `notedb/read_all_external_ids_latency`: Latency for reading all
external ID's from NoteDb.
* `notedb/read_single_account_config_latency`: Latency for reading a single
account config from NoteDb.
* `notedb/read_single_external_id_latency`: Latency for reading a single
external ID from NoteDb.

=== Permissions

* `permissions/permission_collection/filter_latency`: Latency to filter access sections
by user and ref.
* `permissions/ref_filter/full_filter_count`: Rate of full ref filter operations
* `permissions/ref_filter/skip_filter_count`: Rate of ref filter operations where
we skip full evaluation because the user can read all refs

=== Reviewer Suggestion

* `reviewer_suggestion/query_accounts`: Latency for querying accounts for
reviewer suggestion.
* `reviewer_suggestion/recommend_accounts`: Latency for recommending accounts
for reviewer suggestion.
* `reviewer_suggestion/load_accounts`: Latency for loading accounts for
reviewer suggestion.
* `reviewer_suggestion/query_groups`: Latency for querying groups for reviewer
suggestion.

=== Repo Sequences

* `sequence/next_id_latency`: Latency of requesting IDs from repo sequences.

=== Plugin

* `plugin/latency`: Latency for plugin invocation.
* `plugin/error_count`: Number of plugin errors.

=== Group

* `group/guess_relevant_groups_latency`: Latency for guessing relevant groups.

=== Replication Plugin

* `plugins/replication/replication_latency`: Time spent pushing to remote
destination.
* `plugins/replication/replication_delay`: Time spent waiting before pushing to
remote destination.
* `plugins/replication/replication_retries`: Number of retries when pushing to
remote destination.

=== License

* `license/cla_check_count`: Total number of CLA check requests.

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