3.12.5 release notes

Author: michaelklishin

release-notes/3.12.5.md

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+
+RabbitMQ `3.12.5` is a maintenance release in the `3.12.x` [release series](https://www.rabbitmq.com/versions.html).
+
+Please refer to the upgrade section from the [3.12.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.12.0)
+if upgrading from a version prior to 3.12.0.
+
+This release requires Erlang 25 and supports Erlang versions up to `26.0.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 3.12.0, RabbitMQ requires Erlang 25. Nodes **will fail to start** on older Erlang releases.
+
+Users upgrading from 3.11.x (or older releases) on Erlang 25 to 3.12.x on Erlang 26
+(both RabbitMQ *and* Erlang are upgraded at the same time) **must** consult
+the [v3.12.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.12.0) first.
+
+
+## Changes Worth Mentioning
+
+Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v3.12.x/release-notes).
+
+
+### Core Server
+
+#### Bug Fixes
+
+ * Quorum queue leader is now correctly observed in certain network failure scenarios.
+
+   GitHub issues: [#9241](https://github.com/rabbitmq/rabbitmq-server/pull/9241), [#9227](https://github.com/rabbitmq/rabbitmq-server/pull/9227)
+
+ * High consumer churn with reused consumer tag on quorum queues could result in some messages not being delivered
+   after a period of time.
+
+   This did not affect environments where consumer churn does not exist or where it does but consumer tags vary.
+
+   GitHub issue: [#9158](https://github.com/rabbitmq/rabbitmq-server/pull/9158)
+
+ * Three environment variables, `LOG_BASE`, `MNESIA_BASE`, `CONFIG_FILE`, were not picked up when set in
+   `rabbitmq-env-conf.bat` on Windows.
+
+   Gi9158issue: [#9307](https://github.com/rabbitmq/rabbitmq-server/pull/9307)
+
+ * Avoids a potential exception when autoheal partition handling process was initiated.
+
+   GitHub issue: [#9222](https://github.com/rabbitmq/rabbitmq-server/pull/9222)
+
+
+### MQTT Plugin
+
+#### Bug Fixes
+
+ * If a socket write fails, close the connection quickly to avoid producing a lot of
+   log noise.
+
+   GitHub issue: [#9281](https://github.com/rabbitmq/rabbitmq-server/pull/9281)
+
+
+## Dependency Upgrades
+
+ * `osiris` was upgraded to [`1.6.4`](https://github.com/rabbitmq/osiris/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-3.12.5.tar.xz`
+instead of the source tarball produced by GitHub.