- Up to 50% throughput boost for AMQP 0‑9‑1 stream consumers and reduced memory usage for quorum‑queue consumer acknowledgements.
- Added fallback secret configuration for Shovel/Federation credential rotation and enhanced diagnostics to report the crypto library and version.
- Fixed CLI tools on Erlang 25, corrected default log‑level abbreviation, clarified rabbitmqctl log‑level docs, and upgraded credentials‑obfuscation dependency.
RabbitMQ 3.9.18
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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.