- Introduced a new on‑disk storage format with significant performance gains; downgrades only work back to v2.9.22+ to read streams correctly.
- Added many features: new $SYS NATS endpoints, cluster route and leafnode S2 compression, JetStream stream transforms, multi‑subject filtering, replication optimizations, MQTT QoS2 support, and early builds for NetBSD and IBM z/OS.
- Fixed numerous bugs and data races across accounts, leafnodes, JetStream, routing, and profiling components.
Release v2.10.0
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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;