Phase 09 — Operations & observability
Running it for real: history levels, the database, async executor tuning, metrics, and the admin surface.
| # | Lesson | Type | Lang | Ships |
|---|---|---|---|---|
| 01 | The history tables: audit trail vs runtime state ✅ | Concept | — | cheat sheet |
| 02 | History levels & data growth: the retention decision ✅ | Concept | — | decision guide |
| 03 | Async executor tuning: threads, acquisition, lock times ✅ | Use | Java | settings |
| 04 | Metrics & health: what to alert on ✅ | Use | Python | dashboard spec |
| 05 | The database is the engine: sizing, indexes, cleanup jobs ✅ | Concept | — | runbook |
Prerequisites: Phase 2. Full plan: ROADMAP.md.