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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
#### Enhancements
* Metric rendering efficiency improvements (mostly latency)
GitHub issue: [#3587](https://github.com/rabbitmq/rabbitmq-server/pull/3587)
#### 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)
* Restore compatibility with IE 11
GitHub issue: [#3689](https://github.com/rabbitmq/rabbitmq-server/pull/3689)
### 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.
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