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RabbitMQ `3.9.11` 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
* When a TLS-enabled listener failed to stop, it logged all of its settings
which could contain sensitive values.
GitHub issue: [#3803](https://github.com/rabbitmq/rabbitmq-server/issues/3803)
#### Enhancements
* Quorum queues now store commands for enqueued messages in a more compact format
on disk (some derivative data has been dropped).
GitHub issue: [#3804](https://github.com/rabbitmq/rabbitmq-server/pull/3804)
* `queue.declare-ok` response to AMQP 0-9-1 clients operating on a stream could return a ready-for-delivery
message count value that was out of sync with the stream leader replica.
GitHub issue: [#3814](https://github.com/rabbitmq/rabbitmq-server/pull/3814)
* Classic queues now deliver more efficiently on channels that had global QoS changed
during consumer operation.
Contributed by @tomyouyou.
GitHub issue: [rabbitmq/rabbitmq-server#3805](https://github.com/rabbitmq/rabbitmq-server/pull/3805)
### Prometheus Plugin
#### Enhancements
* New optional metrics provided by the `GET /metrics/detailed` endpoint. These metrics are **cluster-wide**,
and therefore must not be aggregated.
GitHub issue: [rabbitmq/rabbitmq-server#3779](https://github.com/rabbitmq/rabbitmq-server/pull/3779)
### Management Agent Plugin
#### Enhancements
* Disabling the plugin will stop metric collection performed periodically by
queues, streams, connections, et cetera.
Contributed by @tomyouyou.
GitHub issue: [rabbitmq/rabbitmq-server#3800](https://github.com/rabbitmq/rabbitmq-server/pull/3800)
## Dependency Upgrades
None in this release.
## Source Code Archives
To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.9.11.tar.xz`
instead of the source tarball produced by GitHub.
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