- Added OCSP fetch, cache, and verification for client and leaf mTLS connections and removed the requirement that all super‑cluster peers share the same CA (security);
- Introduced UTC log timestamps and allowed in‑process client connections without TLS (feature);
- Fixed multiple stability issues including memory leaks, server panic on reload, configuration detection, and several JetStream publishing and recovery bugs (bugfix)
Release v2.9.21
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Added Leafnodes support with a configurable dial timeout option for high‑latency links
Upgrade to Go 1.25.12 and bump critical dependencies (klauspost/compress v1.19.2, golang.org/x/crypto v0.55.0).
Decoupled Raft transport and increased disk concurrency (now configurable) with several JetStream performance and memory optimizations;