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RabbitMQ `3.12.8` 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 `26.1.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 Server
#### Bug Fixes
* Avoids a potential exception in the `autoheal` partition handler.
Contributed by @Ayanda-D.
GitHub issue: [#9818](https://github.com/rabbitmq/rabbitmq-server/pull/9818)
#### Enhancements
* `raft.segment_max_entries` is now validated to prevent the value from overflowing its 16-bit segment file field.
Maximum supported value is now `65535`.
GitHub issue: [#9733](https://github.com/rabbitmq/rabbitmq-server/issues/9733)
### Shovel Plugin
#### Enhancements
* Significantly faster Shovel startup in environments where there are many of them (one thousand or more).
GitHub issue: [#9796](https://github.com/rabbitmq/rabbitmq-server/pull/9796)
### AMQP 1.0 Erlang Client
#### Enhancements
* User-provided credentials are now obfuscated using an one-off key pair generated on node boot.
This keeps sensitive client state information from being logged by the runtime exception logger.
GitHub issue: [#9777](https://github.com/rabbitmq/rabbitmq-server/pull/9777)
## Dependency Upgrades
None in this release.
## Source Code Archives
To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.12.8.tar.xz`
instead of the source tarball produced by GitHub.
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