- Added JetStream monitoring of reserved and used memory via /jsz and /varz endpoints and hardened systemd service.
- Fixed multiple JetStream stability issues: header size limit enforcement, consumer creation validation, idempotent stream creation in clustered mode, negative duplicate window rejection, filestore compaction, memory leaks, and websocket ...
- Server now rejects unsupported token authentication in cluster and gateway configs and validates consumer flow‑control without heartbeat, enhancing security and reliability.
Release v2.6.0
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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;