Initial 4.1.2 release notes

(cherry picked from commit e26fde9086)

release-notes/4.1.2.md

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+RabbitMQ `4.1.2` is a maintenance release in the `4.1.x` [release series](https://www.rabbitmq.com/release-information).
+
+It is **strongly recommended** that you read [4.1.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.1.0)
+in detail if upgrading from a version prior to `4.1.0`.
+
+
+### Minimum Supported Erlang Version
+
+[RabbitMQ and Erlang/OTP Compatibility Matrix](https://www.rabbitmq.com/docs/which-erlang) has more details on Erlang version requirements for RabbitMQ.
+
+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/v4.1.x/release-notes).
+
+
+### Core Server
+
+#### Enhancements
+
+ * Minor memory footprint optimizations.
+
+   GitHub issues: [#14089](https://github.com/rabbitmq/rabbitmq-server/pull/14089), [#14065](https://github.com/rabbitmq/rabbitmq-server/pull/14065), [#14058](https://github.com/rabbitmq/rabbitmq-server/pull/14058)
+
+
+### Stream Plugin
+
+#### Bug Fixes
+
+ = Multiple stream and stream SAC (Single Active Consumer) coordinator resilience improvements.
+
+   GitHub issues: [#14107](https://github.com/rabbitmq/rabbitmq-server/pull/14107), [#14085](https://github.com/rabbitmq/rabbitmq-server/pull/14085), [#14070](https://github.com/rabbitmq/rabbitmq-server/issues/14070)
+
+ * When a stream member (replica) failed, consumer cleanup could affect consumers connected to different nodes.
+
+   GitHub issue: [#13961](https://github.com/rabbitmq/rabbitmq-server/issues/13961)
+
+ * Unhandled stream coordinator exceptions now close stream connections, giving clients a chance to reconnect and reset stream state.
+
+   GitHub issue: [#14040](https://github.com/rabbitmq/rabbitmq-server/issues/14040)
+
+
+
+### CLI Tools
+
+#### Enhancements
+
+ * `rabbitmq-streams activate_stream_consumer` is a new CLI command that forcefully activates a specific consumer in a SAC (Single Active Consumer) group:
+
+   ```shell
+   rabbitmq-streams activate_stream_consumer --stream [stream name] --reference [reference]
+   ```
+
+   This is an emergency operations command that won't be necessary most of the time.
+
+   GitHub issue: [#14055](https://github.com/rabbitmq/rabbitmq-server/issues/14055)
+
+#### Bug Fixes
+
+ * `rabbitmq-streams coordinator_status` command reported an incorrect Raft machine version.
+
+   GitHub issue: [#14112](https://github.com/rabbitmq/rabbitmq-server/pull/14112)
+
+
+### Management Plugin
+
+#### Bug Fixes
+
+ * Eliminated a JavaScript exception that could affect those upgrading from `3.13.x` to `4.x` versions.
+
+   GitHub issue: [#13973](https://github.com/rabbitmq/rabbitmq-server/issues/13973)
+
+ * Virtual host restart form now sanitizes virtual host name.
+
+
+### Dependency Changes
+
+ * `redbug` was upgraded to `2.1.0`
+
+
+## Source Code Archives
+
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-4.1.2.tar.xz`
+instead of the source tarball produced by GitHub.