3.8.20 release notes

(cherry picked from commit 77c0c96)

Author: michaelklishin

release-notes/3.8.20.md

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+## RabbitMQ 3.8.19
+
+RabbitMQ `3.8.20` is a maintenance release.
+
+### Obtaining Packages
+
+RabbitMQ releases are distributed via [GitHub](https://github.com/rabbitmq/rabbitmq-server/releases), [Cloudsmith](https://cloudsmith.io/~rabbitmq/repos/),
+and [PackageCloud](https://packagecloud.io/rabbitmq).
+
+### Erlang/OTP Compatibility Notes
+
+This release [requires Erlang 23.2](https://www.rabbitmq.com/which-erlang.html) and [supports Erlang 24](https://blog.rabbitmq.com/posts/2021/03/erlang-24-support-roadmap/).
+
+[Provisioning Latest Erlang Releases](https://www.rabbitmq.com/which-erlang.html#erlang-repositories) explains
+what package repositories and tools can be used to provision modern Erlang versions.
+
+
+## Upgrade and Compatibility Notes
+
+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.
+
+If upgrading from a`3.7.x` release, see [3.8.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.8.0)
+upgrade and compatibility notes first.
+
+If upgrading from a `3.6.x` or older [release series](https://www.rabbitmq.com/versions.html), first upgrade
+to [`3.7.27`](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.7.27) and then to this version.
+
+
+## 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)
+and [RabbitMQ community Slack](https://rabbitmq-slack.herokuapp.com/).
+
+
+## Changes Worth Mentioning
+
+### Core Server
+
+#### Enhancements
+
+ * Nodes failed to start when hostname contained non-ASCII (broader Unicode) characters.
+
+   GitHub issue: [#3239](https://github.com/rabbitmq/rabbitmq-server/pull/3239)
+
+ * TLS information delivered in [Proxy protocol](https://www.rabbitmq.com/networking.html#proxy-protocol) header
+   is now attached to connection metrics as if it was provided by a non-proxying client.
+
+   GitHub issue: [#3175](https://github.com/rabbitmq/rabbitmq-server/pull/3175) contributed by @prefiks
+
+
+### CLI Tools
+
+#### Bug Fixes
+
+ * `rabbitmq-upgrade drain` and `rabbitmq-upgrade revive` now log and `warning` and `info`
+   level instead of `alert` (that can show up as `error`).
+
+   GitHub issue: [#3266](https://github.com/rabbitmq/rabbitmq-server/pull/3266)
+
+
+### Management Plugin
+
+#### Bug Fixes
+
+  * HTTP API now includes `WWW-Authentiate` header into 401 responses
+    to requests that contain invalid credentials
+
+    GitHub issue: [#3181](https://github.com/rabbitmq/rabbitmq-server/issues/3181)
+
+  * Queue name is now validated for length according to the AMQP 0-9-1 spec.
+
+    GitHub issue: [#3202](https://github.com/rabbitmq/rabbitmq-server/pull/3202)
+
+
+### Shovel Plugin
+
+#### Bug Fixes
+
+ * Multiple Shovels could be started in some cases involving node restarts of failures.
+
+   GitHub issue: [#3263](https://github.com/rabbitmq/rabbitmq-server/pull/3263)
+
+
+### Federation Plugin
+
+#### Bug Fixes
+
+ * Multiple Federation links could be started in some cases involving node restarts of failures.
+
+   GitHub issue: [#3263](https://github.com/rabbitmq/rabbitmq-server/pull/3263)
+
+
+### RabbitMQ Erlang Client
+
+#### Bug Fixes
+
+ * New releases of the client are again published to Hex.pm.
+
+   GitHub issue: [#3247](https://github.com/rabbitmq/rabbitmq-server/pull/3247)
+
+ * `connection_timeout` was adjusted to avoid a confusing warning.
+
+   GitHub issue: [#3232](https://github.com/rabbitmq/rabbitmq-server/pull/3232) contributed by @britto
+
+ * Corrected a typo in direct connection net tick time adjustment.
+
+   GitHub issue: [#3233](https://github.com/rabbitmq/rabbitmq-server/pull/3233) contributed by @britto
+
+
+
+## Dependency Upgrades
+
+No dependency changes in this release.
+
+
+## Source Code Archives
+
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.8.20.tar.xz`
+instead of the source tarball produced by GitHub.