- Adds Streams, a new durable replicated queue type with its own binary protocol for high‑throughput, non‑destructive consumption.
- Switches to Erlang 24 by default, introduces JSON‑structured logging, and expands Prometheus metrics (per‑protocol and queue‑type rates).
- Enhances Kubernetes operators and peer‑discovery, and changes the Management API (user tags now returned as a list), requiring client updates.
RabbitMQ 3.9.0
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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.