- Upgrade requires all 3.11.x feature flags enabled and Erlang 25+ (Erlang 26 compatibility added), otherwise nodes will refuse to start.
- Significant performance, latency, and memory footprint improvements for quorum, classic (CQv2), and MQTT/Web MQTT queues, plus new queue type policies and OAuth2 enhancements.
- Introduces new CLI commands, API changes for plugins, vhost metadata management, and incorporates all bug fixes from the 3.11.x series.
RabbitMQ 3.12.0
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Core server bug fixes: duplicate direct‑reply deliveries, quorum queue recovery issues, malformed AMQP 1.0 frames, topic‑exchange wildcard limits, and OAuth proxy header handling.