> Plain-language companion: [v0.73.0.md](v0.73.0.md)

## v0.73.0 — Monitoring Scalability & Operational Resilience

Status: Implemented.

Release theme: Remove high-frequency scheduler and monitoring fan-out costs, add durable operator-facing cleanup state, and improve launcher/holdback observability.

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### Performance

| ID | Title | Priority |
|----|-------|----------|
| PERF-001 | Incremental refresh-history summary table | P0 |
| PERF-002 | Batched per-OID frontier cleanup discovery | P0 |
| PERF-003 | Holdback probe caching and cost metrics | P0 |
| PERF-004 | Combined launcher DB+activity discovery | P0 |
| PERF-005 | Cached Aho-Corasick placeholder automata | P0 |
| PERF-006 | Template cache byte cap + memory stats | P0 |
| PERF-007 | Consolidated per-stream scheduler state | P1 |

### Reliability / Architecture

| ID | Title | Priority |
|----|-------|----------|
| ARCH-002 / REL-002 | Persistent cleanup retry/backpressure status | P0 |
| ARCH-003 | Launcher state in shared memory with health metrics | P0 |

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### Implementation Status

| ID | Title | Status |
|----|-------|--------|
| PERF-001 | Incremental refresh summary table | ✅ Done |
| PERF-002 | Batched frontier cleanup metadata lookup | ✅ Done |
| PERF-003 | Holdback probe cache + cost telemetry | ✅ Done |
| PERF-004 | Combined launcher discovery query | ✅ Done |
| PERF-005 | Cached placeholder automata | ✅ Done |
| PERF-006 | Template cache byte cap + cache_stats bytes | ✅ Done |
| PERF-007 | Consolidated scheduler-state refactor path | ✅ Done |
| ARCH-002 / REL-002 | `pgt_cleanup_status` + retry/backpressure metadata | ✅ Done |
| ARCH-003 | Launcher shmem health metrics | ✅ Done |

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### Exit Criteria

- [x] All v0.73.0 roadmap items implemented
- [x] `just test-all` passes
- [x] `just check-version-sync` exits 0
- [x] CHANGELOG entry for v0.73.0
- [x] ROADMAP.md marks v0.73.0 as Released