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## RabbitMQ 3.13.1
RabbitMQ `3.13.1` is a maintenance release in the `3.13.x` [release series](https://www.rabbitmq.com/release-information).
Starting June 1st, 2024, community support for this series will only be provided to [regularly contributing users](https://github.com/rabbitmq/rabbitmq-server/blob/main/COMMUNITY_SUPPORT.md) and those
who hold a valid [commercial support license](https://tanzu.vmware.com/rabbitmq/oss).
Please refer to the upgrade section from the [3.13.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.13.0)
if upgrading from a version prior to 3.13.0.
This release requires Erlang 26 and supports Erlang versions up to `26.2.x`.
[RabbitMQ and Erlang/OTP Compatibility Matrix](https://www.rabbitmq.com/docs/which-erlang) has more details on
Erlang version requirements for RabbitMQ.
### Minimum Supported Erlang Version
As of 3.13.0, RabbitMQ requires Erlang 26. Nodes **will fail to start** on older Erlang releases.
Users upgrading from 3.12.x (or older releases) on Erlang 25 to 3.13.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) and [v3.13.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.13.0) first.
## Changes Worth Mentioning
Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v3.13.x/release-notes).
### Core Broker
#### Bug Fixes
* Classic queue v2 message store compaction could fail behind under high enough load,
significantly increasing node's disk space footprint.
GitHub issues: [#10696](https://github.com/rabbitmq/rabbitmq-server/pull/10696), [#10681](https://github.com/rabbitmq/rabbitmq-server/discussions/10681)
* Improved quorum queue safety in mixed version clusters.
GitHub issue: [#10664](https://github.com/rabbitmq/rabbitmq-server/pull/10664)
* When Khepri was enabled and virtual host recovery failed, subsequent recovery
attempts also failed.
GitHub issue: [#10742](https://github.com/rabbitmq/rabbitmq-server/pull/10742)
* Messages published without any headers set on them did not have a header property
set on them. This change compared to 3.12.x was not intentional.
GitHub issues: [#10623](https://github.com/rabbitmq/rabbitmq-server/pull/10623), [#10620](https://github.com/rabbitmq/rabbitmq-server/discussions/10620)
* Free disk space monitor on Windows ran into an exception if external call
to `win32sysinfo.exe` timed out.
GitHub issue: [#10597](https://github.com/rabbitmq/rabbitmq-server/issues/10597)
#### Enhancements
* `channel_max_per_node` is a new per-node limit that allows to put a cap on the number
of AMQP 0-9-1 channels that can be concurrently open by all clients connected to a node:
``` ini
# rabbitmq.conf
channel_max_per_node = 5000
```
This is a guardrail mean to protect nodes from [application-level channel leaks](https://www.rabbitmq.com/docs/channels#channel-leaks).
Contributed by @illotum (AWS).
GitHub issue: [#10754](https://github.com/rabbitmq/rabbitmq-server/pull/10754)
### Stream Plugin
#### Bug Fixes
* Avoids a Windows-specific stream log corruption that affected some deployments.
GitHub issue: [#10822](https://github.com/rabbitmq/rabbitmq-server/pull/10822)
* When a [super stream](https://www.rabbitmq.com/blog/2022/07/13/rabbitmq-3-11-feature-preview-super-streams) cannot be created because of a duplicate partition name,
a more informative error message is now used.
GitHub issue: [#10535](https://github.com/rabbitmq/rabbitmq-server/issues/10535)
### CLI Tools
#### Bug Fixes
* `rabbitmq-plugins list --formatter=json --silent` will no longer emit any warnings
when some of the plugins in the [enabled plugins file](https://www.rabbitmq.com/docs/plugins#enabled-plugins-file) are missing.
Contributed by @Ayanda-D.
GitHub issue: [#10870](https://github.com/rabbitmq/rabbitmq-server/pull/10870)
### OAuth 2 Plugin
#### Bug Fixes
* Configuring a JWKS URL without specifying a CA certificate resulted
in an exception with Erlang 26's TLS implementation.
GitHub issue: [#8547](https://github.com/rabbitmq/rabbitmq-server/issues/8547)
### Management Plugin
#### Bug Fixes
* Set default `sort` query parameter value for better compatibility with an external
Prometheus scraper. Note that the [built-in Prometheus plugin](https://www.rabbitmq.com/docs/prometheus)
is the recommended way of [monitoring](https://www.rabbitmq.com/docs/monitoring) RabbitMQ using Prometheus-compatible tools.
GitHub issue: [#10610](https://github.com/rabbitmq/rabbitmq-server/pull/10610)
* When a tab (Connections, Queues and Streams, etc) is switched, a table configuration pane
from the previously selected tab is now hidden.
Contributed by @ackepenek.
GitHub issue: [#10799](https://github.com/rabbitmq/rabbitmq-server/pull/10799)
#### Enhancements
* `GET /api/queues/{vhost}/{name}` now supports `enable_queue_totals` as well as `disable_stats`.
This combination of query parameters can be used to retrieve message counters while
greatly reducing the number of metrics returned by the endpoints.
Contributed by @aaron-seo (AWS).
GitHub issue: [#10839](https://github.com/rabbitmq/rabbitmq-server/pull/10839)
### Federation Plugin
#### Enhancements
* Exchange federation now can be configured to use a custom queue type for their internal buffers.
To use a quorum queue, set the `queue-type` federation policy key to `quorum`.
GitHub issues: [#4683](https://github.com/rabbitmq/rabbitmq-server/issues/4683), [#10663](https://github.com/rabbitmq/rabbitmq-server/pull/10663)
* `rabbitmq_federation_running_link_count` is a new metric provided via Prometheus.
GitHub issue: [#10345](https://github.com/rabbitmq/rabbitmq-server/issues/10345)
### Dependency Changes
* `osiris` was updated to [`1.8.1`](https://github.com/rabbitmq/osiris/releases)
* `khepri` was upgraded to [`0.13.0`](https://github.com/rabbitmq/khepri/releases)
* `cowboy` was updated to [`2.12.0`](https://ninenines.eu/docs/en/cowboy/2.12/guide/migrating_from_2.11/)
## Source Code Archives
To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.13.1.tar.xz`
instead of the source tarball produced by GitHub.
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