feat: add queue depth metrics for indexer workers#169
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- Add in-process queue depth registry (setQueueDepth/getQueueDepths) in queue-metrics.utils.ts - Workers call setQueueDepth(queue, state, depth) after each poll cycle - Expose GET /api/v1/metrics/queues — returns per-queue, per-state depth with timestamp - Document alerting thresholds: pending>500 warning, >2000 critical; failed>50 warning, >200 critical; dlq>0 warning Co-Authored-By: Claude Sonnet 4.6 <[email protected]>
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Fixes #161
What changed
src/utils/queue-metrics.utils.ts— in-process registry withsetQueueDepth(queue, state, depth)andgetQueueDepths()GET /api/v1/metrics/queuesendpoint returning per-queue, per-state depth with timestampWhy
Operators need visibility into indexer worker backlog without polling the DB. Workers call
setQueueDepth()after each cycle; the metrics endpoint reflects the latest observed depth instantly.How to test
setQueueDepth('creator-events', 'pending', 42)in a test or seed scriptGET /api/v1/metrics/queuesshould return the entry with queue, state, depth, and updatedAtsetQueueDepthagain with a new depth should update the entry