= 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_counts`: Distribution of number of attempts made
by RetryHelper to execute an action (1 == single attempt, no retry)
* `action/retry_timeout_count`: Number of action executions of RetryHelper
that ultimately timed out

=== Pushes

* `receivecommits/changes`: histogram of number of changes processed
in a single upload, split up by update type (new change created,
existing changed updated, change autoclosed).
* `receivecommits/latency`: latency per change for processing a push,
split up by update type (create+replace, and autoclose)
* `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/usage`: CPU time used by the Gerrit process.
* `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/thread/num_live`: Current live thread count.

=== 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.

=== HTTP

* `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.

=== SQL connections

* `sql/connection_pool/connections`: SQL database connections.

=== 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.

=== 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.

=== BatchUpdate

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

=== NoteDb

* `notedb/update_latency`: NoteDb update latency by table.
* `notedb/stage_update_latency`: Latency for staging updates to NoteDb by table.
* `notedb/read_latency`: NoteDb read latency by table.
* `notedb/parse_latency`: NoteDb parse latency by table.
* `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.

=== Permissions

* `permissions/project_state/computation_latency`: Latency to compute current access
sections on a project by traversing it's parents.
* `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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