- Added configurable WebSocket ping interval and improved MQTT retained message handling and payload limits.
- Performance and reliability upgrades: faster JetStream scans, Raft quorum and membership fixes, and filestore compaction stability.
- Numerous bugfixes addressing data races, stream desyncs, snapshot handling, and ACL permission nuances.
Release v2.12.3
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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;