Create an incident timeline from control and queue events
The post-incident discussion relies on memory of when pauses and retries changed.
- Focused work estimate
- 2h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Auditability · Incident analysis
Estimated field mix
- Site reliability80%
- Data 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
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- BINCIDENT-101 · Report oldest eligible job age alongside queue depth
- BINCIDENT-102 · Separate arrival rate from successful service rate
- BINCIDENT-104 · Pause selected producers while preserving accepted work
- BINCIDENT-103 · Identify poison jobs without starving unrelated work
- BINCIDENT-105 · Recover expired worker leases without concurrent duplicate effects
- BINCIDENT-106 · Tune retry delay for a throttled dependency
- BINCIDENT-107 · Estimate backlog drain time under explicit capacity assumptions
- BINCIDENT-108 · Rehearse backlog recovery with a constrained worker budget
Acceptance criteria
- Record control actions with actor and UTC time.
- Link changes to observed backlog metrics.
- Separate observations from causal hypotheses.
Implementation constraints
- Exclude customer payloads and personal operator commentary.
Verification to include
- Reconstruct the synthetic incident.
- Show a missing observation as a gap rather than inventing timing.
Deliverables
- Incident timeline exporter.
Rollout and recovery
Preserve original event records; append corrections to the timeline.
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.