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RabbitMQ `3.9.8` 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
* When the mandatory flag was used when publishing to classic queues,
but publisher confirms were not, channels memory usage would grow indefinitely.
GitHub issue: [#3560](https://github.com/rabbitmq/rabbitmq-server/issues/3560)
* `rabbitmq-diagnostics memory_breakdown` failed to read memory of connection
reader, writer and channel processes.
GitHub issue: [#3570](https://github.com/rabbitmq/rabbitmq-server/issues/3570)
* In some environments, Stream replicas advertised IP addresses that could not be reached by cluster peers
(eg. IP addresses behind a NAT in a Docker deployment). RabbitMQ node hostnames are now advertised as well
so that other peers can resolve them to get an externally visible IP address.
GitHub issue: [rabbitmq/osiris#53](https://github.com/rabbitmq/osiris/issues/53)
### Prometheus Plugin
#### Enhancements
* More data is exposed via the `GET /metrics/detailed` endpoint.
GitHub issue: [#3520](https://github.com/rabbitmq/rabbitmq-server/pull/3520)
### Management Plugin
#### Bug Fixes
* When setting topic permissions, the list of exchanges in the UI now honors the
currently selected virtual host.
Contributed by @LuisCusihuaman.
GitHub issue: [#3545](https://github.com/rabbitmq/rabbitmq-server/pull/3545)
### AWS Peer Discovery Plugin
#### Enhancements
* The plugin now logs more details for failed AWS API requests.
Contributed by @tvhong-amazon (AWS)
GitHub issue: [#3579](https://github.com/rabbitmq/rabbitmq-server/pull/3579)
### Web STOMP Plugin
#### Enhancements
* STOMP-over-WebSockets connections now can consume from [streams](https://rabbitmq.com/streams.html).
GitHub issue: [#3509](https://github.com/rabbitmq/rabbitmq-server/pull/3509)
## Dependency Upgrades
* Osiris was [upgraded to `1.2.2`](https://github.com/rabbitmq/osiris/compare/v1.2.0...v1.2.2)
## Source Code Archives
To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.9.8.tar.xz` instead of the source tarball produced by GitHub.
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