rabbitmq-server/release-notes/3.9.15.md

RabbitMQ `3.9.15` 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

 * Stream delivery rate could drop if concurrent stream consumers consumed in a way
   that made them reach the end of the stream often.

   GitHub issue: [#4371](https://github.com/rabbitmq/rabbitmq-server/pull/4371)


### Prometheus Plugin

#### Bug Fixes

 * Prometheus collector could run into an exception early on node's
   schema database sync.

   GitHub issue: [#4376](https://github.com/rabbitmq/rabbitmq-server/pull/4376)


### Management Plugin

#### Bug Fixes

 * `rabbitmqadmin` now correctly loads TLS-related keys from its configuration file.

   Contributed by @fwolfsjaeger.

   GitHub issue: [#4408](https://github.com/rabbitmq/rabbitmq-server/pull/4408)


### LDAP Plugin

#### Enhancements

  * More Erlang 24.3's `eldap` library compatibility improvements.

    GitHub issue: [#4448](https://github.com/rabbitmq/rabbitmq-server/pull/4448)


## Dependency Upgrades

 * `ra` upgraded [from `2.0.4` to `2.0.6`](https://github.com/rabbitmq/ra/compare/v2.0.4...v2.0.6)
 * `prometheus` upgraded from [`4.8.1` to `4.8.2`](https://github.com/deadtrickster/prometheus.erl/compare/06425c21a39c1564164f1cc3fe5bdfa8b23b1f78...v4.8.2)


## Source Code Archives

To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.9.15.tar.xz`
instead of the source tarball produced by GitHub.