Metrics about Gerrit’s internal state can be sent to external monitoring systems via plugins. See the 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, 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/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. 
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. 
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. 
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. 
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.