- Upgrade storage schema versions (MySQL/Postgres to 1.9, Cassandra to 1.7) is required before moving to v1.19; server now runs on Go 1.19 and includes tctl v1.17.2.
- Metrics subsystem is overhauled: metrics.Client/Scope replaced by metricsHandler, “per tl” metrics deprecated, and batch‑delete operation added; also introduces workflow‑close state cleanup, new pending‑item limits, per‑type poller caps,...
- Extensive bug fixes and internal refactors across persistence, replication, UI and other components.