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RabbitMQ `3.11.6` 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
#### Enhancements
* Lower per-queue memory footprint. This optimization saves about 1 GiB of memory for
every 100K classic queues, so, for 3M MQTT connections the savings would add up to 30 GiB.
GitHub issue: [#5551](https://github.com/rabbitmq/rabbitmq-server/pull/5551)
* It is now possible to configure default operator policies for virtual hosts
that match a naming pattern:
``` ini
default_operator_policies.1.vhost_pattern = ^device
default_operator_policies.1.queue_pattern = .*
default_operator_policies.1.max_length_bytes = 1GB
default_operator_policies.1.max_length = 1000000
```
Contributed by @illotum (AWS).
GitHub issues: [#6380](https://github.com/rabbitmq/rabbitmq-server/issues/6380), [#4999](https://github.com/rabbitmq/rabbitmq-server/issues/4999)
* Preserve additional information in the log message when heartbeat frame cannot
be sent due to a TCP timeout.
GitHub issue: [#6708](https://github.com/rabbitmq/rabbitmq-server/pull/6708)
#### Bug Fixes
* Nodes [under maintenance](https://rabbitmq.com/upgrade.html#maintenance-mode) will no longer considered for stream replica placement.
GitHub issue: [#3370](https://github.com/rabbitmq/rabbitmq-server/issues/3370)
* Feature flag operations logged incorrect module name in some cases.
GitHub issue: [#6694](https://github.com/rabbitmq/rabbitmq-server/pull/6694)
### CLI Tools
#### Enhancements
* `rabbitmq-upgrade await_online_quorum_plus_one` will now consider stream replicas in addition to quorum queue replicas.
GitHub issue: [#4890](https://github.com/rabbitmq/rabbitmq-server/issues/4890)
#### Bug Fixes
* Listing listeners (including via `rabbitmq-diagnostics status`) could fail with an exception
if target node was shutting down.
Contributed by @gomoripeti (CloudAMQP).
GitHub issue: [#6719](https://github.com/rabbitmq/rabbitmq-server/pull/6719)
### Management Plugin
#### Enhancements
* Support for Identity Provider-initiated Login (IDP).
GitHub issues: [#6015](https://github.com/rabbitmq/rabbitmq-server/pull/6015), [#6201](https://github.com/rabbitmq/rabbitmq-server/pull/6201),
[#6247](https://github.com/rabbitmq/rabbitmq-server/pull/6247)
#### Bug Fixes
* Use a more modern method (browser feature) for definition file downloads.
GitHub issue: [#6674](https://github.com/rabbitmq/rabbitmq-server/pull/6674)
* Perform HTML escaping of a user-provided error parameter used by some UI states.
Contributed by @dentarg (CloudAMQP).
GitHub issue: [#6780](https://github.com/rabbitmq/rabbitmq-server/pull/6780)
## Dependency Upgrades
* `ra` was upgraded [from `2.4.5` to `2.4.6`](https://github.com/rabbitmq/ra/releases)
## Source Code Archives
To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.11.6.tar.xz`
instead of the source tarball produced by GitHub.
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