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RabbitMQ `3.11.9` is a maintenance release in the `3.11.x` [release series](https://www.rabbitmq.com/versions.html).
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.
[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 Server
#### Bug Fixes
* Stream delivery using [RabbitMQ Stream protocol](https://github.com/rabbitmq/rabbitmq-server/blob/v3.11.x/deps/rabbitmq_stream/docs/PROTOCOL.adoc) v2 could fail to start in some cases.
GitHub issue: [#7118](https://github.com/rabbitmq/rabbitmq-server/pull/7118)
* Nodes could run into an exception with certain publishers that used QPid for client library.
GitHub issue: [#7119](https://github.com/rabbitmq/rabbitmq-server/issues/7119)
* When discovering feature flags across the cluster, default stability level is now `experimental` and not `stable`.
GitHub issue: [#7156](https://github.com/rabbitmq/rabbitmq-server/pull/7156)
* Reset and manually added nodes could start receiving stream replica data before its database was initialized,
confusing all code paths that expected a blank node state.
GitHub issue: [#7222](https://github.com/rabbitmq/rabbitmq-server/pull/7222)
* Fixed a minor issue with feature flag log message formatting.
GitHub issue: [#7233](https://github.com/rabbitmq/rabbitmq-server/pull/7233)
#### Enhancements
* Improved support for the AMQP 1.0 message format (used internally by streams), in particular, when original message
was published using AMQP 1.0.
GitHub issue: [#7001](https://github.com/rabbitmq/rabbitmq-server/pull/7001)
### CLI Tools
#### Features
* `rabbitmqctl set_permissions_globally` is a new command that sets up user permissions in all existing virtual hosts.
GitHub issue: [#1000](https://github.com/rabbitmq/rabbitmq-server/issues/1000)
* `rabbitmq-diagnostics cluster_status` now lists how many CPU cores are available to individual nodes, plus a total.
GitHub issue: [#7135](https://github.com/rabbitmq/rabbitmq-server/pull/7135)
### Management Plugin
#### Bug Fixes
* Limits tab failed to load when there were no limits configured.
GitHub issue: [#7142](https://github.com/rabbitmq/rabbitmq-server/issues/7142)
#### Enhancements
* It is now possible to disable operator policy modifications. This can be necessary in
RabbitMQ-as-a-Service environments.
Contributed by @illotum (AWS).
GitHub issue: [#7131](https://github.com/rabbitmq/rabbitmq-server/issues/7131)
### AMQP 1.0 Plugin
#### Enhancements
* Support for [OAuth 2 authentication and authorization backends](https://rabbitmq.com/oauth2.html).
GitHub issue: [#6931](https://github.com/rabbitmq/rabbitmq-server/pull/6931)
### MQTT Plugin
#### Bug Fixes
* MQTT nodes did not correctly remove client IDs for clients connected to a node that was in the process of
being removed from the cluster.
GitHub issue: [#7162](https://github.com/rabbitmq/rabbitmq-server/pull/7162)
### OAuth 2 Plugin
#### Bug Fixes
* `auth_oauth2.additional_scopes_key` had no effect.
Contributed by @brunomedeirosdedalus.
GitHub issue: [#7190](https://github.com/rabbitmq/rabbitmq-server/pull/7190)
### LDAP Plugin
#### Bug Fixes
* Due to a `$` sign escaping differences between Make and Bazel (the newly adopted build tool),
default value of of `user_dn_pattern` setting was incorrect (had an extra `$`).
GitHub issue: [#7161](https://github.com/rabbitmq/rabbitmq-server/issues/7161)
## Dependency Upgrades
None in this release.
## Source Code Archives
To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.11.9.tar.xz`
instead of the source tarball produced by GitHub.
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