Merge pull request #10284 from rabbitmq/mk-3.12.12-release-notes

3.12.12 release notes

Author: michaelklishin

release-notes/3.12.12.md

@@ -0,0 +1,99 @@
+RabbitMQ `3.12.12` 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 `26.2.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 Broker
+
+#### Bug Fixes
+
+ * Environments with a lot of quorum queues could experience a large Erlang process
+   build-up. The build-up was temporary but with a sufficiently large number of
+   quorum queues it could last until the next round of periodic operations,
+   making it permanent and depriving the node of CPU resources.
+
+   GitHub issue: [#10242](https://github.com/rabbitmq/rabbitmq-server/pull/10242)
+
+ * RabbitMQ core failed to propagate more authentication and authorization context, for example,
+   MQTT client ID in case of MQTT connections, to authN and authZ backends. This was not intentional.
+
+   GitHub issue: [#10230](https://github.com/rabbitmq/rabbitmq-server/pull/10230)
+
+ * Nodes now takes more precaution about persisting feature flag state
+   (specifically the effects of in-flight changes) during node shutdown.
+
+   GitHub issue: [#10279](https://github.com/rabbitmq/rabbitmq-server/pull/10279)
+
+#### Enhancements
+
+ * Simplified some type specs.
+   
+   Contributed by @ariel-anieli.
+
+   [#10228](https://github.com/rabbitmq/rabbitmq-server/pull/10228)
+
+                                                                                                            
+### Stream Plugin
+
+ * One returned error value did not match the [RabbitMQ Stream Protocol](https://github.com/rabbitmq/rabbitmq-server/blob/v3.9.x/deps/rabbitmq_stream/docs/PROTOCOL.adoc) specification.
+
+   GitHub issue: [#10277](https://github.com/rabbitmq/rabbitmq-server/pull/10277)
+
+
+### MQTT Plugin
+
+#### Bug Fixes
+
+ * Recovering connections from QoS 0 consumers (subscribers) could fail if they were previously connected to a failed node.
+
+   GitHub issue: [#10252](https://github.com/rabbitmq/rabbitmq-server/pull/10252)
+
+
+### CLI Tools
+
+#### Bug Fixes
+
+ * Since [#10131](https://github.com/rabbitmq/rabbitmq-server/pull/10131) (shipped in `3.12.11`, some CLI commands in certain scenarios could fail to accept input via standard output.
+
+   GitHub issues: [#10270](https://github.com/rabbitmq/rabbitmq-server/pull/10270), [#10258](https://github.com/rabbitmq/rabbitmq-server/pull/10258)
+
+
+### AWS Peer Discovery Plugin
+
+#### Enhancements
+
+ * Updated some type specs.
+   
+   Contributed by @ariel-anieli.
+
+   [#10226](https://github.com/rabbitmq/rabbitmq-server/pull/10226)
+
+
+## Dependency Upgrades
+
+None in this release.
+
+
+## Source Code Archives
+
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.12.12.tar.xz`
+instead of the source tarball produced by GitHub.