- Offloaded quorum‑queue log reads to channels, boosting consumer throughput and CPU utilization; added AMQP 1.0 filter expression support and rabbitmqadmin v2 with richer CLI operations.
- Breaking changes: AMQP 0‑9‑1 frame‑max raised to 8192 (affects amqplib <0.10.7), MQTT max packet size lowered to 16 MiB, unsupported etcd peer‑discovery settings, and required Erlang 26.2+.
- Security and stability enhancements: larger JWT tokens accepted, OAuth 2.0 token renewal, improved feature‑flag handling on node boot, and numerous bug fixes for quorum queues and AMQP connections.
RabbitMQ 4.1.0
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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.