- Updated Go runtime to version 1.25.11.
- Fixed a JetStream regression that caused stale subject state and 'Message Not Found' errors when a max‑messages‑per‑subject limit was configured.
- Provided reference to the 2.12 Upgrade Guide for backward‑compatibility notes.
Release v2.12.11
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Decoupled Raft transport and increased disk concurrency (now configurable) with several JetStream performance and memory optimizations;
Decoupled JetStream Raft transport and increased disk concurrency semaphore to 4096 (configurable via max_concurrent_io) to improve performance and memory handling;
Fixed numerous bugs and race conditions across authentication, routing, monitoring, JetStream, Raft, and MQTT, preventing panics, memory leaks, and stream desynchronisation.