Report emulated edge-job lateness separately from duration
A slow-started job is blamed on execution time because metrics combine queue delay and work duration. Separate them.
- Focused work estimate
- 1h 45m + prerequisites
- Priority in the scenario
- Low
- Engineering practice
- Observability · Measurement
Estimated field mix
- Embedded and edge50%
- Performance engineering30%
- Site reliability20%
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
Fictional kiosk software schedules cache refresh and display housekeeping. Build a software clock and job adapter; do not control real machinery or purchase hardware.
Setup prerequisites
- Implement injected wall and monotonic clocks.
- Create synthetic jobs with controllable completion and failure.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- CTIMER-101 · Use monotonic time for edge-job timeout deadlines
- CTIMER-102 · Validate emulated edge-job intervals before scheduling
- CTIMER-103 · Specify fixed-delay behavior for periodic kiosk maintenance
- CTIMER-104 · Cancel emulated edge jobs without accepting late callbacks
- CTIMER-105 · Prevent overlapping edge jobs that share one local resource
- CTIMER-106 · Bound emulated edge-job execution attempts after failure
- CTIMER-107 · Recover due edge jobs after restart without a catch-up storm
- CTIMER-108 · Keep edge-job priority from starving lower-priority maintenance
Acceptance criteria
- Lateness measures due-to-start
- Duration measures start-to-finish
- Clock corrections do not corrupt elapsed metrics
Implementation constraints
- Report synthetic local observations, not hardware deadlines.
Verification to include
- Queue then execute job
- Change wall clock during execution
Deliverables
- Scheduler metric schema and cases
Rollout and recovery
Hide derived latency fields if clock provenance is missing.
Value of the work
For the engineer: Practice timer semantics, cancellation and bounded scheduling.
For the team: Inspect predictable edge resource use and honest execution status.
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.