- Added four optional environment variables (RABBITMQ_DEFAULT_USER, _PASS, _VHOST, _ERLANG_COOKIE) to configure defaults, useful for containerized deployments.
- Definitions can now be imported from multiple sources such as URLs, directories, or plugins, while retaining backward‑compatible local file support.
- Introduced new Prometheus metrics for alarm states (file‑descriptor limit, disk‑space watermark, memory‑watermark).
RabbitMQ 3.9.4
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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.