Initial 3.9.11 release notes

(cherry picked from commit ce995c76d9648dc02fa560ab6609075f2c3731c9)

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  * Make stream coordinator more defensive to rapid declaration and deletion cycles
 
-   GitHub issue: [#33731631](https://github.com/rabbitmq/rabbitmq-server/pull/3731)
+   GitHub issue: [#3731](https://github.com/rabbitmq/rabbitmq-server/pull/3731)
 
 #### Enhancements
 
diff --git a/release-notes/3.9.11.md b/release-notes/3.9.11.md
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+RabbitMQ `3.9.11` is a maintenance release in the `3.9.x` release series.
+
+Please refer to the **Upgrading to 3.9** section from [v3.9.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.9.0) if upgrading from a version prior to 3.9.0.
+
+This release requires at least Erlang 23.2, and supports Erlang 24. [RabbitMQ and Erlang/OTP Compatibility Matrix](https://www.rabbitmq.com/which-erlang.html) has more details on Erlang version requirements for RabbitMQ.
+
+
+
+## Changes Worth Mentioning
+
+Release notes are kept under [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v3.9.x/release-notes).
+Contributors are encouraged to update them together with their changes. This helps with release automation and a more consistent release schedule.
+
+### Core Server
+
+#### Bug Fixes
+
+ * When a TLS-enabled listener failed to stop, it logged all of its settings
+   which could contain sensitive values.
+
+   GitHub issue: [#3803](https://github.com/rabbitmq/rabbitmq-server/issues/3803)
+
+#### Enhancements
+
+ * Quorum queues now store commands for enqueued messages in a more compact format
+   on disk (some derivative data has been dropped).
+
+   GitHub issue: [#3804](https://github.com/rabbitmq/rabbitmq-server/pull/3804)
+
+ * `queue.declare-ok` response to AMQP 0-9-1 clients operating on a stream could return a ready-for-delivery
+   message count value that was out of sync with the stream leader replica.
+
+   GitHub issue: [#3814](https://github.com/rabbitmq/rabbitmq-server/pull/3814)
+
+ * Classic queues now deliver more efficiently on channels that had global QoS changed
+   during consumer operation.
+
+   Contributed by @tomyouyou.
+
+   GitHub issue: [rabbitmq/rabbitmq-server#3805](https://github.com/rabbitmq/rabbitmq-server/pull/3805)
+
+
+### Prometheus Plugin
+
+#### Enhancements
+
+ * New optional metrics provided by the `GET /metrics/detailed` endpoint. These metrics are **cluster-wide**,
+   and therefore must not be aggregated.
+
+   GitHub issue: [rabbitmq/rabbitmq-server#3779](https://github.com/rabbitmq/rabbitmq-server/pull/3779)
+
+
+### Management Agent Plugin
+
+#### Enhancements
+
+ * Disabling the plugin will stop metric collection performed periodically by
+   queues, streams, connections, et cetera.
+
+   Contributed by @tomyouyou.
+
+   GitHub issue: [rabbitmq/rabbitmq-server#3800](https://github.com/rabbitmq/rabbitmq-server/pull/3800)
+
+
+
+## Dependency Upgrades
+
+None in this release.
+
+
+## Source Code Archives
+
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.9.11.tar.xz`
+instead of the source tarball produced by GitHub.