Add background job queue-age metrics - #14746
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The grouped queue snapshot includes the oldest age as a duration using the database clock. Existing metric consumers continue to report counts.
The worker records queue ages in seconds alongside counts with the same job and priority attributes. Previously observed queues report zero after draining, and failed collection records no partial snapshot.
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This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed. Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers. |
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Queue-age metrics let us move background-job health thresholds out of application code and configure them in Datadog.
The new
crates_io.background_jobs.oldest_agegauge reports seconds since the oldest outstanding job was enqueued, grouped by job type and priority. It includes running jobs and reports zero after a queue drains. Existing service checks remain in place until replacement monitors are ready.Related
opentelemetrymetrics support #14700