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RabbitMQ `3.12.13` is a maintenance release in the `3.12.x` [release series](https://www.rabbitmq.com/versions.html).
This release [goes out of community support](https://www.rabbitmq.com/release-information) on June 1st, 2024.
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 `26.2.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 Broker
#### Bug Fixes
* When a channel is closed, its consumer metric samples will now be cleared differently
depending on the number of them. In [#9356](https://github.com/rabbitmq/rabbitmq-server/pull/9356), it was over optimized for the uncommon case with
a very large number of consumers per channel, hurting the baseline case with one or a few consumers
per channel.
In part contributed by @SimonUnge (AWS).
GitHub issue: [#10478](https://github.com/rabbitmq/rabbitmq-server/pull/10478)
### CLI Tools
#### Enhancement
* CLI tool startup time was reduced.
GitHub issue: [#10461](https://github.com/rabbitmq/rabbitmq-server/pull/10461)
#### Bug Fixes
* JSON output formatter now avoids ANSI escape sequences.
Contributed by @ariel-anieli.
GitHub issue: [#8557](https://github.com/rabbitmq/rabbitmq-server/issues/8557)
* ANSI escape sequences are no longer used on Windows.
Contributed by @ariel-anieli.
GitHub issue: [#2634](https://github.com/rabbitmq/rabbitmq-server/issues/2634)
### Stream Plugin
#### Bug Fixes
* If a stream publisher cannot be set up, a clearer message will be logged.
GitHub issue: [#10524](https://github.com/rabbitmq/rabbitmq-server/pull/10524)
### Management Plugin
#### Bug Fixes
* `GET /api/nodes/{name}` failed with a 500 when called with a non-existed node name.
GitHub issue: [#10330](https://github.com/rabbitmq/rabbitmq-server/issues/10330)
### Shovel Plugin
#### Bug Fixes
* AMQP 1.0 Shovels will no longer set a delivery mode header that is not meaningful in AMQP 1.0.
Contributed by @luos (Erlang Solutions).
GitHub issue: [#10503](https://github.com/rabbitmq/rabbitmq-server/pull/10503)
### Federation Plugin
#### Bug Fixes
* Upstream node shutdown could produce a scary looking exception in the log.
GitHub issue: [#10473](https://github.com/rabbitmq/rabbitmq-server/pull/10473)
* Exchange federation links could run into an exception.
Contributed by @gomoripeti (CloudAMQP).
GitHub issue: [#10305](https://github.com/rabbitmq/rabbitmq-server/pull/10305)
### Dependency Changes
* `cowboy` was updated to [`2.11.0`](https://ninenines.eu/docs/en/cowboy/2.11/guide/migrating_from_2.10/)
## Source Code Archives
To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.12.13.tar.xz`
instead of the source tarball produced by GitHub.
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