Why This Matters

Tempo trace parsing is important for RCA quality, but there is no direct service test module for it.

Read First

• app/services/grafana/tempo.py

Scope

1. Add direct tests for the mixin using the same fake-client pattern as the Loki/Mimir tests.
2. Cover one successful trace-query response.
3. Cover the failure envelope.

Tests / Coverage

• tests/services/test_grafana_tempo.py
• cover trace parsing
• cover not-configured behavior
• cover exception handling

Acceptance Criteria

• Tempo behavior has direct unit coverage
• tests stay isolated from tool formatting
• result keys remain stable