3.11.9 release notes

release-notes/3.11.9.md

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+RabbitMQ `3.11.9` is a maintenance release in the `3.11.x` [release series](https://www.rabbitmq.com/versions.html).
+
+Please refer to the upgrade section from [v3.11.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.11.0)
+if upgrading from a version prior to 3.11.0.
+
+This release requires Erlang 25.
+[RabbitMQ and Erlang/OTP Compatibility Matrix](https://www.rabbitmq.com/which-erlang.html) has more details on
+Erlang version requirements for RabbitMQ.
+
+
+### Minimum Supported Erlang Version
+
+As of 3.11.0, RabbitMQ requires Erlang 25. Nodes **will fail to start** on older Erlang releases.
+
+Erlang 25 as our new baseline means much improved performance on ARM64 architectures, [profiling with flame graphs](https://blog.rabbitmq.com/posts/2022/05/flame-graphs/)
+across all architectures, and the most recent TLS 1.3 implementation available to all RabbitMQ 3.11 users.
+
+
+## Changes Worth Mentioning
+
+Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v3.11.x/release-notes).
+
+### Core Server
+
+#### Bug Fixes
+
+ * Stream delivery using [RabbitMQ Stream protocol](https://github.com/rabbitmq/rabbitmq-server/blob/v3.11.x/deps/rabbitmq_stream/docs/PROTOCOL.adoc) v2 could fail to start in some cases.
+
+   GitHub issue: [#7118](https://github.com/rabbitmq/rabbitmq-server/pull/7118)
+
+ * Nodes could run into an exception with certain publishers that used QPid for client library.
+
+   GitHub issue: [#7119](https://github.com/rabbitmq/rabbitmq-server/issues/7119)
+
+ * When discovering feature flags across the cluster, default stability level is now `experimental` and not `stable`.
+
+   GitHub issue: [#7156](https://github.com/rabbitmq/rabbitmq-server/pull/7156)
+
+#### Enhancements
+
+ * Improved support for the AMQP 1.0 message format (used internally by streams), in particular, when original message
+   was published using AMQP 1.0.
+
+   GitHub issue: [#7001](https://github.com/rabbitmq/rabbitmq-server/pull/7001)
+
+
+### CLI Tools
+
+#### Features
+
+ * `rabbitmq-diagnostics cluster_status` now lists how many CPU cores are available to individual nodes, plus a total.
+
+   GitHub issue: [#7135](https://github.com/rabbitmq/rabbitmq-server/pull/7135)
+
+
+### Management Plugin
+
+#### Bug Fixes
+
+ * Limits tab failed to load when there were no limits configured.
+
+   GitHub issue: [#7142](https://github.com/rabbitmq/rabbitmq-server/issues/7142)
+
+
+### AMQP 1.0 Plugin
+
+#### Enhancements
+
+ * Support for [OAuth 2 authentication and authorization backends](https://rabbitmq.com/oauth2.html).
+
+   GitHub issue: [#6931](https://github.com/rabbitmq/rabbitmq-server/pull/6931)
+
+
+### MQTT Plugin
+
+#### Bug Fixes
+
+ * MQTT nodes did not correctly remove client IDs for clients connected to a node that was in the process of
+   being removed from the cluster.
+
+   GitHub issue: [#7162](https://github.com/rabbitmq/rabbitmq-server/pull/7162)
+
+
+### LDAP Plugin
+
+#### Bug Fixes
+
+ * Due to a `$` sign escaping differences between Make and Bazel (the newly adopted build tool),
+   default value of of `user_dn_pattern` setting was incorrect (had an extra `$`).
+
+   GitHub issue: [#7161](https://github.com/rabbitmq/rabbitmq-server/issues/7161)
+
+
+## Dependency Upgrades
+
+None in this release.
+
+
+## Source Code Archives
+
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.11.9.tar.xz`
+instead of the source tarball produced by GitHub.