The @PLUGIN@ plugin reports the status of its internal components to Gerrit metric system.
The metrics are all prefixed with @PLUGIN@ and then divided in groups, depending on the component involved.
This prefix represents the component involved in the processing of incoming ref-update events from Gerrit or other event-broker sources.
queued_before_startup Counter of the number of events that have been received when the plugin was still in its starting phase and not ready yet to process events.This prefix represents the tasks scheduling and execution system, also known as replication queue. The replication task represents one operation performed against a Git repository from a remote source. The task may involve one or more refs.
The <metric> field can have one of the values described here below, while the <source> represent the replication source endpoint.
Bear in mind that the replication queue is a lot more than a simple queueing system, as it contains the logic for selecting, merging, retrying and cancelling incoming tasks.
scheduled: (counter) number of tasks triggered and scheduled for execution.
in_flight: (gauge) number of tasks currently being executed.
pending: (gauge) number of tasks waiting to be executed.
started: (counter) number of tasks started.
rescheduled: (counter) number of tasks re-scheduled for execution.
cancelled: (counter) number of tasks that were previously scheduled and then cancelled before being executed.
failed: (counter) number of tasks executed but failed altogether or partially. A total failure is when the entire operation returned an error and none of the operations took place; a partial failure is when some of the operations in the tasks succeeded but other failed.
retrying: (counter) number of tasks being retried for execution.
not_scheduled: (counter) number of tasks which have been discarded before being executed, because redundant (duplicate of existing scheduled tasks) or not needed anymore (e.g. ref updated already by other means or other checks)
completed: (counter) number of tasks completed successfully.
merged: (counter) number of tasks not being executed because they had been consolidated with an existing scheduled task.
failed_max_retries: (counter) number of tasks that have reached their maximum retry count but never succeeded.
apply_object_latency: (timer) execution time statistics for the synchronous replication using the apply-object REST-API.
apply_object_end_2_end_latency: (timer) execution time statistics for the end-2-end replication from when the event is triggered in Gerrit until the successful execution of the synchronous replication using the apply-object REST-API.
apply_object_max_api_payload_reached: (counter) number of times that the apply-object REST-API did fallback to the fetch REST-API because it reached its maximum payload to transfer.
replication_latency: (timer) execution time statistics for the synchronous replication using a git fetch.
replication_end_2_end_latency: (timer) execution time statistics for the end-2-end replication from when the event is triggered in Gerrit until the successful execution of the git fetch for the associated refs.
replication_delay: (timer) interval from when the ref-update event is triggered to the start of the git fetch command.
replication_retries: (counter) number of times that a replication task has been retried.