3.9.28 release notes

release-notes/3.9.28.md

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+RabbitMQ `3.9.28` is a maintenance release in the `3.9.x` release series.
+
+This series [**reaches end of general support** on Jan 31st, 2023](https://rabbitmq.com/versions.html).
+
+Please refer to the **Upgrading to 3.9** section from [v3.9.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.9.0)
+if upgrading from a version prior to 3.9.0.
+
+This release requires at least Erlang 24.3, and supports 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
+
+Erlang 23 support has reached its [end of support](https://www.rabbitmq.com/which-erlang.html).
+
+Starting with this release, RabbitMQ requires Erlang 24.3 or later versions. Nodes **will fail to start** on older Erlang releases.
+
+## Changes Worth Mentioning
+
+Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v3.9.x/release-notes).
+
+### Core Server
+
+#### Enhancements
+
+ * Preserve additional information in the log message when heartbeat frame cannot
+   be sent due to a TCP timeout.
+
+   GitHub issue: [#6708](https://github.com/rabbitmq/rabbitmq-server/pull/6708)
+
+
+### CLI Tools
+
+#### Bug Fixes
+
+ * `rabbitmqctl add_vhost` now coerces a single string value of `--tags` into an array.
+
+   GitHub issue: [#6877](https://github.com/rabbitmq/rabbitmq-server/pull/6877)
+
+
+### Web STOMP Plugin
+
+#### Bug Fixes
+
+ * `ERROR` frames delivery is now correctly delivered w.r.t. TCP connection closure for clients that run into
+   certain types of exceptions.
+
+   Contributed by @csicar.
+
+   GitHub issue: [#6789](https://github.com/rabbitmq/rabbitmq-server/pull/6789)
+
+## Dependency Upgrades
+
+ * `ra` was upgraded [from `2.4.5` to `2.4.6`](https://github.com/rabbitmq/ra/releases)
+ * `prometheus.erl` was upgraded [from `4.9.1` to `4.10.0`](https://github.com/deadtrickster/prometheus.erl/tags)
+
+
+## Dependency Upgrades
+
+None in this release.
+
+
+## Source Code Archives
+
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.9.27.tar.xz`
+instead of the source tarball produced by GitHub.