Merge pull request #6800 from rabbitmq/mergify/bp/v3.11.x/pr-6799

3.11.6 release notes (backport #6799)

Author: michaelklishin

release-notes/3.11.6.md

@@ -0,0 +1,111 @@
+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.
+
+   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.