Expire raw workflow events while preserving only approved aggregates
Correlation-bearing raw events remain forever although reporting needs only daily counts.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Retention engineering · Aggregation
Estimated field mix
- Privacy engineering60%
- Data engineering40%
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 workspace wants to measure upload completion and failure. Its prototype sends filenames, document titles and raw errors to general analytics. Replace that path with a minimal event contract using synthetic traffic.
Setup prerequisites
- Create synthetic upload workflows and a local collector that captures received payloads.
- Define measurement questions and a separate restricted diagnostic store fixture.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- RTELEMETRY-101 · Translate upload questions into bounded telemetry events
- RTELEMETRY-102 · Reject unknown telemetry fields at the sending boundary
- RTELEMETRY-103 · Use a short-lived workflow correlation ID with a defined scope
- RTELEMETRY-104 · Map upload errors to safe categories before analytics dispatch
- RTELEMETRY-105 · Keep restricted upload diagnostics out of the analytics transport
- RTELEMETRY-106 · Drop telemetry safely when validation or the collector fails
Acceptance criteria
- Version fictional raw-event and aggregate retention rules.
- Remove expired raw events from the declared sink and replay buffers.
- Report unresolved copies and avoid assuming aggregates cannot identify people.
Implementation constraints
- Use injected time and local adapters; retention values are exercise inputs, not real-world policy advice.
Verification to include
- Advance beyond raw expiry and verify sink and replay cleanup while permitted counts remain.
- Fail one cleanup adapter and verify its unresolved location appears in the report.
Deliverables
- Telemetry retention job and copy-reconciliation cases
Rollout and recovery
Preview eligibility before removal and version aggregate definitions when collection changes.
Value of the work
For the engineer: Practice minimization, safe failure handling and correct aggregates.
For the team: Produce useful operational measurements with a reviewable collection boundary and disclosure regression suite.
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.