- - Requires Erlang 25; older Erlang versions will not start (breaking compatibility).
- - Reduces per‑queue memory usage (~1 GiB per 100 K classic queues) and adds configurable default operator‑policy pattern matching for virtual hosts.
- - Adds IDP‑initiated login support, stream‑replica awareness in `rabbitmq upgrade await`, and improves logging, CLI, and UI security (HTML escaping, modern definition‑file download method).
RabbitMQ 3.11.6
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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.