Report oldest eligible job age alongside queue depth
A shallow queue can still contain a single customer job stuck for hours.
- Focused work estimate
- 1h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Queue observability
Estimated field mix
- Site reliability80%
- Platform engineering20%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional document service has a rising processing backlog. Operators cannot tell whether arrivals, worker failures, or a slow dependency is responsible.
Setup prerequisites
- Create a bounded local queue simulation with synthetic jobs and controllable worker/dependency failures.
Preceding work
No earlier ticket is required. Complete the project setup above.
Acceptance criteria
- Measure oldest eligible age separately from count.
- Exclude scheduled future work from overdue age.
- Show missing timestamp records explicitly.
Implementation constraints
- Use bounded job-type labels only.
Verification to include
- Measure a known delayed fixture.
- Keep future-scheduled jobs out of overdue calculations.
Deliverables
- Backlog age metric.
Rollout and recovery
Add read-only metrics before changing worker behavior.
Value of the work
For the engineer: Practice incident timelines, queue diagnosis, and measured recovery.
For the team: Produce a repeatable response that preserves work integrity and exposes customer delay.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.