A production rollout exposes a contract mismatch between the UI boundary and the owning service. The affected area is event pipeline.
Repair the event pipeline cache lifecycle implementation so it separates purge, refresh, and escalation actions by staleness and risk.
Evidence
- Affected surface: Cloud-native full-stack / event pipeline.
- Observed failure family: plan cache invalidation.
- Scope policy: region must equal eu-west.