- Khepri storage engine graduates from experimental to fully supported; AMQP 1.0 becomes a core protocol with >2× throughput and new topology management.
- Quorum queues gain priorities, sub‑linear recovery, and a default redelivery limit of 20; classic queue mirroring is removed, making classic queues non‑replicated.
- TLS client verification is now enabled by default, default max message size drops to 16 MiB, and several legacy config options (CQv1 storage, deprecated settings) are removed.
RabbitMQ 4.0.1
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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.