- Refactored JetStream consumer header handling, made start‑sequence scanning asynchronous, added leafnode connect advisory, and improved stream leader catch‑up and roll‑up behavior.
- Fixed numerous stability bugs including panics in compression negotiation, Raft commit index reset, message header mutation, concurrent map writes, snapshot recovery, and corrected JWT claim validation and monitoring redaction.
- Enhanced security by redacting route/cluster URL secrets, preventing monitoring endpoints from disclosing bearer JWTs, and tightening JWT claim validation across midnight.
Release v2.12.8
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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;