- Khepri replaces Mnesia as the sole metadata store; Mnesia and partition‑handling config keys are removed, requiring config cleanup and affecting plugins
- Classic queue v1 storage is removed and transient non‑exclusive queues are disabled by default, moving several deprecated features to denied‑by‑default status
- Quorum queues receive major feature upgrades: strict priority queues, delayed retry back‑off, configurable consumer and disconnected timeouts, faster snapshotting, memory optimisations, unlimited explicit returns, plus the x‑modulus‑hash...
RabbitMQ 4.3.0
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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.