Merge pull request #8879 from rabbitmq/mergify/bp/v3.11.x/pr-8878

3.11.20 release notes (backport #8877) (backport #8878)

Author: michaelklishin

release-notes/3.11.20.md

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+RabbitMQ `3.11.20` 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 and supports Erlang versions up to `25.3.x`.
+[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
+
+ * Fixed a potential resource leak in at-least-once dead lettering from quorum queues.
+
+   GitHub issue: [#8799](https://github.com/rabbitmq/rabbitmq-server/pull/8799)
+
+
+### CLI Tools
+
+#### Enhancements
+
+ * A new command, `rabbitmqctl deactivate_free_disk_space_monitoring`, can be used to (temporarily or permanently) disable
+   free disk space monitoring on a node.
+
+   To re-activate it, use `rabbitmqctl activate_free_disk_space_monitoring`.
+
+   GitHub issue: [#8801](https://github.com/rabbitmq/rabbitmq-server/pull/8801)
+
+
+### AMQP 1.0 Plugin
+
+#### Bug Fixes
+
+ * AMQP 1.0 clients that try to publish in a way that results in the message not being routed
+   anywhere are now notified with a more sensible settlement status.
+
+   GitHub issue: [#7823](https://github.com/rabbitmq/rabbitmq-server/issues/7823)
+
+
+### Prometheus Plugin
+
+#### Enhancements
+
+ * Prometheus scraping API endpoints now support optional authentication.
+
+   Contributed by @SimonUnge (AWS).
+
+   GitHub issue: [#8683](https://github.com/rabbitmq/rabbitmq-server/pull/8683)
+
+ * The plugin now filters out values that are `undefined` or `NaN`, simply excluding
+   them from the API endpoint response.
+
+   Previously, if a metric was not computed for any reason (e.g. free disk space monitor
+   was disabled on the node), its value could end up being rendered as `undefined` or `NaN`,
+   two values that Prometheus scrapers cannot handle (for numerical types such as gauges).
+
+   GitHub issue: [#8660](https://github.com/rabbitmq/rabbitmq-server/issues/8660)
+
+
+### Management Plugin
+
+#### Bug Fixes
+
+ * It was not possible to close a table column selection pane on
+   screens that had little vertical space.
+
+   Contributed by @Antsthebul.
+
+   GitHub issue: [#8701](https://github.com/rabbitmq/rabbitmq-server/pull/8701)
+
+
+## Dependency Upgrades
+
+ * `ra` was upgraded to [`2.6.3`](https://github.com/rabbitmq/ra/releases)
+
+
+## Source Code Archives
+
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.11.20.tar.xz`
+instead of the source tarball produced by GitHub.