- Default AMQP 1.0 durable field now defaults to false, requiring clients to set it explicitly – a breaking change for existing producers.
- Adds several new features: SQL‑style stream filters, Direct Reply‑To for AMQP 1.0, incoming/outgoing message interceptors, Khepri as the default metadata store, local‑protocol shovels, and fanout‑exchange throughput improvements.
- Removes .cacerts settings, updates Raft/Quorum metrics, and includes numerous bug fixes (classic‑queue message loss, quorum‑queue replication during partitions, startup failures for missing plugins, etc.).
RabbitMQ 4.2.0
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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.