- Fixed numerous race conditions, panics, and data‑race issues across authentication, routing, monitoring, JetStream, and Raft, improving stability and security.
- Demoted per‑connection log lines to debug level and applied writer options consistently in s2 fast compression mode.
- Removed Monitoring JSONP callback support from monitoring endpoints.
Release v2.12.12
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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.