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## RabbitMQ 3.7.22
RabbitMQ `3.7.22` is a maintenance release that focuses on bug fixes.
RabbitMQ `3.7.x` series is supported [through March 2020](https://www.rabbitmq.com/versions.html).
### Erlang/OTP Compatibility Notes
Per the new Erlang version support policy in effect starting with January 2019,
this release [**no longer supports Erlang/OTP 20.3**](https://groups.google.com/d/msg/rabbitmq-users/G4UJ9zbIYHs/qCeyjkjyCQAJ).
Make sure a [supported Erlang version](https://www.rabbitmq.com/which-erlang.html) is used before upgrading.
[Provisioning Latest Erlang Releases](https://www.rabbitmq.com/which-erlang.html#erlang-repositories) explains
what package repositories and tools can be used to provision latest patch versions of Erlang `21.3.x` and `22.x`.
### Compatibility Notes
#### Upgrading to Erlang 21.x or Later Versions
When upgrading to this release **and upgrading Erlang to 21.x or later** at the same time, extra care has to be taken.
Since CLI tools from RabbitMQ releases older than 3.7.7 will fail on Erlang 21 or later,
RabbitMQ **must be upgraded before Erlang**.
#### Upgrade Doc Guides and Change Log
See [3.7.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.7.0) upgrade
and compatibility notes first if upgrading from an earlier release.
See the [Upgrading guide](https://www.rabbitmq.com/upgrade.html) for general documentation on upgrades
and [RabbitMQ change log](https://www.rabbitmq.com/changelog.html) for release notes of other releases.
### Getting Help
Any questions about this release, upgrades or RabbitMQ in general are welcome on the
[RabbitMQ mailing list](https://groups.google.com/forum/#!forum/rabbitmq-users).
## Changes
### Core Server
#### Bug Fixes
* One-off Erlang VM starts used by startup scripts now do as little work as possible
in order to avoid starting subcomponents, loading configuration and so on.
GitHub issue: [rabbitmq/rabbitmq-common#340](https://github.com/rabbitmq/rabbitmq-common/pull/340)
### CLI Tools
#### Bug Fixes
* `rabbitmqctl await_startup` failed with an exception when RabbitMQ application was stopped but the
runtime (Erlang VM) was running.
GitHub issue: [rabbitmq/rabbitmq-server#2158](https://github.com/rabbitmq/rabbitmq-server/issues/2158)
### Management Plugin
#### Bug Fixes
* Definition import via HTTP API could fail in if performed via HTTP API (but not management UI)
and contained operator policies.
GitHub issue: [rabbitmq/rabbitmq-management#751](https://github.com/rabbitmq/rabbitmq-management/issues/751)
* When a node cannot compute the number of file descriptors it uses, it will be more resilient and will
log warnings (e.g. about missing `handle.exe` in `PATH` on Windows) much more proactively.
GitHub issue: [rabbitmq/rabbitmq-management-agent#86](https://github.com/rabbitmq/rabbitmq-management-agent/issues/86)
#### Enhancements
* Metric aggregation optimizations.
GitHub issue: [rabbitmq/rabbitmq-management-agent#84](https://github.com/rabbitmq/rabbitmq-management-agent/pull/84)
### MQTT Plugin
#### Enhancements
* Throughput improvements and reduced CPU usage but slightly higher per connection RAM footprint.
Contributed by Grigory Starinkin (Erlang Solutions).
GitHub issues: [rabbitmq/rabbitmq-mqtt#216](https://github.com/rabbitmq/rabbitmq-mqtt/pull/216), [rabbitmq/rabbitmq-mqtt#217](https://github.com/rabbitmq/rabbitmq-mqtt/pull/217)
#### Bug Fixes
* Last Will messages that use QoS 2 will now be downgraded to QoS 1 just like with "regular" published messages.
GitHub issue: [rabbitmq/rabbitmq-mqtt#214](https://github.com/rabbitmq/rabbitmq-mqtt/issues/214)
## Source code archives
**Warning**: The source code archive provided by GitHub only contains the source of the broker,
not the plugins or the client libraries. Please download the archive named `rabbitmq-server-3.7.22.tar.xz`.
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