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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 [is no longer covered by community support](https://www.rabbitmq.com/release-information).
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.
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