- Added NewServerFromConfig API for loading external configs and enabled WebSocket leafnode connections to use HTTP proxies with configurable write deadlines.
- Improved JetStream performance: faster TTL handling, meta snapshot optimizations, binary search for timestamp lookups, and reduced heap allocations in the filestore.
- Fixed numerous bugs and race conditions across JetStream, filestore, and server shutdown handling, including TTL state recovery, scheduled message triggering, and raft stability.
Release v2.12.1
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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;