> Plain-language companion for v0.73.0 implementation.
>
> Detailed status: [v0.73.0.md-full.md](v0.73.0.md-full.md)

## v0.73.0 — Monitoring Scalability & Operational Resilience

Status: Released.

### Completed Items

- [x] PERF-001: Incremental refresh-history summary table (`pgtrickle.pgt_refresh_summary`) and monitoring queries migrated off per-stream lateral history scans.
- [x] PERF-002: Batched per-OID frontier-cleanup metadata discovery in a single SPI query.
- [x] PERF-003: xmin holdback probe caching plus probe-cost/cache-hit metrics.
- [x] PERF-004: Combined launcher database+activity discovery query with shared-memory launcher health metrics.
- [x] PERF-005: Cached Aho-Corasick placeholder resolver automata aligned with delta templates.
- [x] PERF-006: Byte-size cap for template cache and `cache_stats()` memory-bytes column.
- [x] PERF-007: Scheduler state consolidation groundwork (single health/metrics path and per-stream state tracking refactor support).
- [x] ARCH-002 / REL-002: Persistent `pgt_cleanup_status` table with retry/backpressure metadata.
- [x] ARCH-003: Launcher shared-memory state and health metrics exported for observability.

### Notes

- The v0.73.0 roadmap file was missing before implementation; this file and the full-details companion were added.
- SQL migration `0.72.0 -> 0.73.0` includes table creation and summary backfill.
