- Removes the 4 GiB limit on Raft log segment files with a new on‑disk format, making downgrades to earlier 3.8.x versions impossible.
- Adds full Erlang 23 compatibility and updates plugins (e.g., Prometheus) for the new memory‑allocator metric format.
- Switches etcd peer discovery to the etcd v3 API (deprecating v2), enables SNI by default, and bundles numerous bug fixes and CLI/management enhancements.
RabbitMQ 3.8.4
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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.