RabbitMQ 4.0.0 is a major release that introduces several key improvements. The most notable updates include the full support for Khepri as an alternative to Mnesia, the inclusion of AMQP 1.0 as a core protocol, efficient quorum queue recovery, support for priorities in quorum queues, and the removal of mirroring for classic queues. Several breaking changes are listed, including deprecated configurations and reduced default maximum message size. The upgrade requires enabling all feature flags from version 3.13.x.
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