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3.10.21 release notes (backport #8037) #8038

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2 changes: 1 addition & 1 deletion release-notes/3.10.20.md
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Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v3.10.x/release-notes).


## Core Server
### Core Server

### Bug Fixes

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59 changes: 59 additions & 0 deletions release-notes/3.10.21.md
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RabbitMQ `3.10.21` is a maintenance release in the `3.10.x` [release series](https://www.rabbitmq.com/versions.html).

This series [**reaches its end of community support** on July 31st, 2023](https://rabbitmq.com/versions.html).

Please refer to the upgrade section from [v3.10.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.10.0)
if upgrading from a version prior to 3.10.0.

This release **requires Erlang 24.3** and supports Erlang 25.
[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

Erlang 23 and 24 versions older than 24.3 have reached [end of support](https://www.rabbitmq.com/which-erlang.html).

This release of RabbitMQ [requires Erlang 24.3.4.8](https://github.com/rabbitmq/rabbitmq-packaging/pull/35)
or later versions. Nodes **will fail to start** on older Erlang releases.

Erlang 25.3 is recommended: it offers 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.


## Changes Worth Mentioning

Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v3.10.x/release-notes).


### Management Plugin

#### Bug Fixes

* It was impossible to return to a tab that had a filter expression
that was not a valid regular expressions.

Now such expressions will be used as regular text filters.

GitHub issue: [#8008](https://github.com/rabbitmq/rabbitmq-server/issues/8008)


### HTTPS AuthN/AuthZ Backend Plugin

#### Bug Fixes

* The authorization backend could run into an exception when used in
combination with other backends.

GitHub issue: [#7864](https://github.com/rabbitmq/rabbitmq-server/issues/7864)


## Dependency Upgrades

None in this release.


## Source Code Archives

To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.10.21.tar.xz`
instead of the source tarball produced by GitHub.