3.9.9 release notes

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+RabbitMQ `3.9.9` 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 the latest Erlang 24 version, 24.1.2 at the time of release. [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
+
+ * Fixed an issue where node monitor could produce a false network partition when
+   one of the cluster members was restarted
+
+   GitHub issue: [#3631](https://github.com/rabbitmq/rabbitmq-server/pull/3631)
+
+ * Message store resiliency improvements
+
+   GitHub issue: [#3615](https://github.com/rabbitmq/rabbitmq-server/pull/3615)
+
+ * Reduced log noise in certain scenarios where a new queue leader is elected
+
+   GitHub issue: [#3628](https://github.com/rabbitmq/rabbitmq-server/pull/3628)
+
+ * Queue leader rebalancing now logs less
+
+   GitHub issue: [#3643](https://github.com/rabbitmq/rabbitmq-server/pull/3643)
+
+#### Enhancements
+
+ * `cluster_formation.target_cluster_size_hint` is a new configuration setting that can be used to specify expected initial cluster size.
+   This can be used by features, plugins or tools that expect a certain minimum number of clusters nodes
+   to join during initial cluster formation
+
+   GitHub issue: [#3635](https://github.com/rabbitmq/rabbitmq-server/pull/3635)
+
+
+### Prometheus Plugin
+
+#### Bug Fixes
+
+ * TLS-enabled Prometheus endpoint listener port was not correctly stored internally
+
+   GitHub issue: [#2975](https://github.com/rabbitmq/rabbitmq-server/issues/2975)
+
+
+### Management Plugin
+
+#### Bug Fixes
+
+ * Persistent message count is now displayed correctly on individual queue pages
+
+   GitHub issue: [#3598](https://github.com/rabbitmq/rabbitmq-server/pull/3598)
+
+
+### Consistent Hashing Exchange Plugin
+
+#### Bug Fixes
+
+ * Corrected deletion of duplicate bindings between an exchange and a queue
+
+   Contributed by @FalconerTC
+
+   GitHub issue: [#3594](https://github.com/rabbitmq/rabbitmq-server/pull/3594)
+
+
+## Dependency Upgrades
+
+* Ra was [upgraded to `2.0.2`](https://github.com/rabbitmq/ra/compare/v2.0.0...v2.0.2)
+
+* Osiris was [upgraded to `1.2.3`](https://github.com/rabbitmq/osiris/compare/v1.2.2...v1.2.3)
+
+
+## Source Code Archives
+
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.9.9.tar.xz`
+instead of the source tarball produced by GitHub.