- Requires Erlang 26+; nodes on older Erlang versions will fail to start (breaking change).
- Adds optional cluster and node tags, periodic policy re‑application for quorum queues, and reduces CPU/network overhead for large stream workloads (new features).
- Fixes multiple core bugs: quorum queue leader election, stream time‑out handling, MQTT TTL conversion, TLS SAN configuration, and various plugin/CLI issues.
RabbitMQ 4.0.4
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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.