- Added numerous JetStream enhancements, including fast ingest batch publishing, atomic batch commit, consumer reset API, scheduled message support, async stream snapshots, and new feature‑flag configuration.
- Improved leafnode management, domain‑aware ack/flow control, and reinforced Raft and filestore reliability with error handling, snapshot safety, and node overrun handling.
- Introduced breaking changes: MQTT retained messages now reject ASCII DEL (0x7F) characters and traceparent header is no longer modified; also adjusted no‑wait consumer API behavior.
Release v2.14.0
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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;