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 input boundary implementation so it normalizes valid records and returns field-level errors for invalid ones.
Evidence
- Affected surface: Full-stack frontend focus / client telemetry.
- Observed failure family: validate a record batch.
- Scope policy: contractVersion must equal 2.