gochat_background_jobs:
  query: |
    SELECT
      queue,
      status,
      COUNT(*)::double precision AS total,
      COALESCE(MAX(EXTRACT(EPOCH FROM (CURRENT_TIMESTAMP - CASE
        WHEN status = 'running' THEN COALESCE(locked_at, updated_at)
        ELSE scheduled_at
      END))), 0)::double precision AS oldest_seconds
    FROM background_jobs
    WHERE status IN ('queued', 'retrying', 'running')
    GROUP BY queue, status
  metrics:
    - queue:
        usage: LABEL
        description: Background job queue.
    - status:
        usage: LABEL
        description: Background job state.
    - total:
        usage: GAUGE
        description: Current background jobs by queue and state.
    - oldest_seconds:
        usage: GAUGE
        description: Age of the oldest background job by queue and state.