= 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//pool_size`: Current number of threads in the pool * `queue//max_pool_size`: Maximum allowed number of threads in the pool * `queue//active_threads`: Number of threads that are actively executing tasks * `queue//scheduled_tasks`: Number of scheduled tasks in the queue * `queue//total_scheduled_tasks_count`: Total number of tasks that have been scheduled * `queue//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/auto_rebuild_latency`: NoteDb auto-rebuilding latency by table. * `notedb/auto_rebuild_failure_count`: NoteDb auto-rebuilding attempts that failed 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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