A cross-layer workflow passes unit tests but breaks when client, API, and persistence state arrive in a different order. The affected area is outbox worker.
Repair the outbox worker performance telemetry implementation so it computes a fixed-width rolling average in event order.
Evidence
- Affected surface: Full-stack backend focus / outbox worker.
- Observed failure family: compute rolling metrics.
- Scope policy: region must equal eu-west.