Lesson 110: Customer-visible failure observability
Focus
Bias toward observable metrics: latency, cost, escalation rate. Token Customer-visible failure observability:110 keeps neighbouring lessons differentiable.
Key ideas
- Thread: Customer-visible failure observability · drill v10 · spin
261612. - Habit: attach a trace_id to every completion you would paste into an ops dashboard.
- Guardrail: add one RACI bullet for prompt or index changes before tomorrow's standup.
Deep dive notebook
Synthetic drill artefacts
Logging contract
| Field | Retention |
|-------|-----------|
| trace_id | 12d |
| prompt_hash | policy-defined |
| completion_excerpt | 24h hot |
Mask tier `pii-v1` before persistence.
Practice
Practice Pair with security on one prompt-injection tabletop scenario. — 110 Bump 19.