- Added TLS certificate expiry information to the varz monitoring endpoint.
- Improved JetStream performance and correctness (reduced lock contention, optimized filter recalculations, and removal of no‑interest messages).
- Fixed numerous JetStream bugs and server issues, including panics, race conditions, stream drift, encryption key recovery, and subscription leaks.
Release v2.12.4
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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;