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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)
* If a cluster that had streams enabled was upgraded with a jump of multiple
patch releases, stream state could fail an upgrade.
GitHub issue: [#4510](https://github.com/rabbitmq/rabbitmq-server/issues/4510)
* Significantly faster queue re-import from [definitions](https://rabbitmq.com/definitions.html)
on subsequent node restarts. Initial definition import still takes
the same amount of time as before.
GitHub issue: [#4538](https://github.com/rabbitmq/rabbitmq-server/pull/4538)
* When a policy contained keys unsupported by a particular queue
type, and later updated or superseded by a higher priority policy,
effective optional argument list could become inconsistent (policy
would not have the expected effect).
Kudos to @jaroslaw-bochniak for providing very detailed reproduction steps.
GitHub issue: [#4463](https://github.com/rabbitmq/rabbitmq-server/pull/4463)
* Priority queues could run into an exception in some cases.
Contributed by @luos and @olikasg.
GitHub issue: [#4405](https://github.com/rabbitmq/rabbitmq-server/issues/4405)
* Maintenance mode could run into a timeout during queue leadership transfer.
Contributed by @felixhuettner.
GitHub issue: [#4468](https://github.com/rabbitmq/rabbitmq-server/pull/4468)
### 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
* Connection data transfer rate units were incorrectly displayed when
rate was less than 1 kiB per second.
Contributed by @zgabi.
GitHub issue: [#4523](https://github.com/rabbitmq/rabbitmq-server/issues/4523)
* `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)
* Corrected a help message for node memory usage tool tip.
Contributed by @etc-crontab.
GitHub issue: [#4493](https://github.com/rabbitmq/rabbitmq-server/issues/4493)
### 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 `2.0.9`](https://github.com/rabbitmq/ra/compare/v2.0.4...v2.0.9)
* `prometheus` upgraded from [`4.8.1` to `4.8.2`](https://github.com/deadtrickster/prometheus.erl/compare/06425c21a39c1564164f1cc3fe5bdfa8b23b1f78...v4.8.2)
* `eetcd` upgraded from [`0.3.3` to `0.3.5`](https://github.com/zhongwencool/eetcd/compare/v0.3.3...v0.3.5)
## 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.
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