Merge pull request #10116 from rabbitmq/mergify/bp/v3.11.x/pr-10115

3.11.27 release notes (backport #10114) (backport #10115)

release-notes/3.11.27.md

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+RabbitMQ `3.11.27` is a maintenance release in the `3.11.x` [release series](https://www.rabbitmq.com/versions.html).
+This release series [goes out of community support on Dec 31, 2023](https://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 Broker
+
+#### Bug Fixes
+
+ * Avoids a rare exception that could stop TCP socket writes on a client connection.
+
+   GitHub issues: [#9991](https://github.com/rabbitmq/rabbitmq-server/issues/9991), [#9803](https://github.com/rabbitmq/rabbitmq-server/discussions/9803)
+
+#### Enhancements
+
+ * Definition files that are virtual host-specific cannot be imported on boot. Such files will now be
+   detected early and the import process will terminate after logging a more informative message.
+
+   Previous the import process would run into an obscure exception.
+
+   GitHub issues: [#10068](https://github.com/rabbitmq/rabbitmq-server/issues/10068), [#10086](https://github.com/rabbitmq/rabbitmq-server/pull/10086)
+
+
+### Shovel Plugin
+
+#### Bug Fixes
+
+ * Avoids two Shovels being started after an upgrade from `3.11.25` or older versions.
+
+   Two Shovels running concurrently would still transfer messages but because they act as
+   competing consumers (and publishers), this affected message ordering in the target queue.
+
+   Contributed by @gomoripeti (CloudAMQP).
+
+   GitHub issues: [#9965](https://github.com/rabbitmq/rabbitmq-server/pull/9965), [#10080](https://github.com/rabbitmq/rabbitmq-server/pull/10080)
+
+
+### Management Plugin
+
+#### Bug Fixes
+
+ * `DELETE /api/policies/{vhost}/{policy}` returned a 500 response instead of a 404 one
+   when target virtual host did not exist.
+
+   GitHub issue: [#9983](https://github.com/rabbitmq/rabbitmq-server/issues/9983)
+
+
+## Dependency Upgrades
+
+ None in this release.
+
+
+## Source Code Archives
+
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.11.27.tar.xz`
+instead of the source tarball produced by GitHub.