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
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proc/birth_timestamp: Time at which the Gerrit process started.
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proc/uptime: Uptime of the Gerrit process.
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proc/cpu/usage: CPU time used by the Gerrit process.
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proc/num_open_fds: Number of open file descriptors.
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proc/jvm/memory/heap_committed: Amount of memory guaranteed for user objects.
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proc/jvm/memory/heap_used: Amount of memory holding user objects.
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proc/jvm/memory/non_heap_committed: Amount of memory guaranteed for classes, etc.
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proc/jvm/memory/non_heap_used: Amount of memory holding classes, etc.
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proc/jvm/memory/object_pending_finalization_count: Approximate number of objects needing finalization.
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proc/jvm/gc/count: Number of GCs.
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proc/jvm/gc/time: Approximate accumulated GC elapsed time.
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proc/jvm/thread/num_live: Current live thread count.
Caches
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caches/memory_cached: Memory entries.
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caches/memory_hit_ratio: Memory hit ratio.
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caches/memory_eviction_count: Memory eviction count.
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caches/disk_cached: Disk entries used by persistent cache.
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caches/disk_hit_ratio: Disk hit ratio for persistent cache.
HTTP
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http/server/error_count: Rate of REST API error responses.
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http/server/success_count: Rate of REST API success responses.
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http/server/rest_api/count: Rate of REST API calls by view.
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http/server/rest_api/error_count: Rate of REST API calls by view.
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http/server/rest_api/server_latency: REST API call latency by view.
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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
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queue/<queue_name>/max_pool_size: Maximum allowed number of threads in the pool
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queue/<queue_name>/active_threads: Number of threads that are actively executing tasks
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queue/<queue_name>/scheduled_tasks: Number of scheduled tasks in the queue
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queue/<queue_name>/total_scheduled_tasks_count: Total number of tasks that have been scheduled
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queue/<queue_name>/total_completed_tasks_count: Total number of tasks that have completed execution
SSH sessions
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sshd/sessions/connected: Number of currently connected SSH sessions.
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sshd/sessions/created: Rate of new SSH sessions.
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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.
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topic/cross_project_submit_completed: number of cross-project topic submissions that concluded successfully.
JGit
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jgit/block_cache/cache_used: Bytes of memory retained in JGit block cache.
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jgit/block_cache/open_files: File handles held open by JGit block cache.
Git
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git/upload-pack/request_count: Total number of git-upload-pack requests.
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git/upload-pack/phase_counting: Time spent in the 'Counting…' phase.
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git/upload-pack/phase_compressing: Time spent in the 'Compressing…' phase.
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git/upload-pack/phase_writing: Time spent transferring bytes to client.
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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
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batch_update/retry_attempt_counts: Distribution of number of attempts made by RetryHelper (1 == single attempt, no retry)
- 
batch_update/retry_timeout_count: Number of executions of RetryHelper that ultimately timed out
NoteDb
- 
notedb/update_latency: NoteDb update latency by table.
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notedb/stage_update_latency: Latency for staging updates to NoteDb by table.
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notedb/read_latency: NoteDb read latency by table.
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notedb/parse_latency: NoteDb parse latency by table.
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notedb/auto_rebuild_latency: NoteDb auto-rebuilding latency by table.
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notedb/auto_rebuild_failure_count: NoteDb auto-rebuilding attempts that failed by table.
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notedb/external_id_update_count: Total number of external ID updates.
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notedb/read_all_external_ids_latency: Latency for reading all external ID’s from NoteDb.
Reviewer Suggestion
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reviewer_suggestion/query_accounts: Latency for querying accounts for reviewer suggestion.
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reviewer_suggestion/recommend_accounts: Latency for recommending accounts for reviewer suggestion.
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reviewer_suggestion/load_accounts: Latency for loading accounts for reviewer suggestion.
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reviewer_suggestion/query_groups: Latency for querying groups for reviewer suggestion.
Repo Sequences
- 
sequence/next_id_latency: Latency of requesting IDs from repo sequences.
Replication Plugin
- 
plugins/replication/replication_latency: Time spent pushing to remote destination.
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plugins/replication/replication_delay: Time spent waiting before pushing to remote destination.
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plugins/replication/replication_retries: Number of retries when pushing to remote destination.