A production rollout exposes a contract mismatch between the UI boundary and the owning service. The affected area is client telemetry.
Repair the client telemetry request stream implementation so it enforces a per-key sliding window and reports allowed and rejected requests.
Evidence
- Affected surface: Full-stack frontend focus / client telemetry.
- Observed failure family: apply a sliding rate window.
- Scope policy: contractVersion must equal 2.