- Added new client traffic metrics (client msgs/bytes in/out) to the /varz endpoint.
- Improved TLS handling: certificates without subject DNs but with SANs are accepted and TLS listeners now work with the PROXY protocol.
- Numerous stability fixes: resolved deadlocks, race conditions, panics, and lock contention across clustering, JetStream, Raft, and leafnode components.
Release v2.12.9
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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;