- Dropped support for Erlang 21.3 – requires Erlang 22 or 23
- Fixed quorum‑queue crash during rolling upgrades and a reverse‑DNS lookup connection issue
- Upgrade may require simultaneous Erlang upgrade when moving from older RabbitMQ versions
RabbitMQ 3.8.11
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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.