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= 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.
=== 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,
* `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/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.
=== Query
* `query/query_latency`: Successful query latency, accumulated over the life
of the process.
=== 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.
=== 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.
=== 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.
=== Reviewer Suggestion
* `reviewer_suggestion/query_accounts`: Latency for querying accounts for
reviewer suggestion.
* `reviewer_suggestion/query_groups`: Latency for querying groups for reviewer
=== Replication Plugin
* `plugins/replication/replication_latency`: Time spent pushing to remote
* `plugins/replication/replication_delay`: Time spent waiting before pushing to
remote destination.
* `plugins/replication/replication_retries`: Number of retries when pushing to
remote destination.
Part of link:index.html[Gerrit Code Review]