RabbitMQ - v3.11.21

RabbitMQ 3.11.21 is a maintenance release in the 3.11.x release series.
This release series goes out of community support on Dec 31, 2023.

Please refer to the upgrade section from v3.11.0 release notes
if upgrading from a version prior to 3.11.0.

This release requires Erlang 25 and supports Erlang versions up to 25.3.x.
RabbitMQ and Erlang/OTP Compatibility Matrix has more details on
Erlang version requirements for RabbitMQ.

Minimum Supported Erlang Version

As of 3.11.0, RabbitMQ requires Erlang 25. Nodes will fail to start on older Erlang releases.

Erlang 25 as our new baseline means much improved performance on ARM64 architectures, profiling with flame graphs
across all architectures, and the most recent TLS 1.3 implementation available to all RabbitMQ 3.11 users.

Changes Worth Mentioning

Release notes can be found on GitHub at rabbitmq-server/release-notes.

Core Server

Bug Fixes

• Certain diagnostics operations during rolling upgrades from 3.10 to 3.11 could fail
  if the listener_records_in_ets feature flag was enabled in the middle of the upgrade.

Contributed by @gomoripeti (CloudAMQP).

GitHub issue: #8984

• On Windows, PowerShell will no longer be used as a fallback for handle.exe
  for computing how many file and socket handles a node uses.

If a user does not have handle.exe`` installed in thePATH`` of their Windows system,
a message will be logged once, and then the total handles being used will be set to 0.

PowerShell ended up being a CPU-intensive alternative that's not worth the gains
for many installations.

GitHub issue: #8700

• Node maintenance state was not replicated to all nodes, even though it was accessible
  from any node (and for any node).

GitHub issue: #9011

CLI Tools

Enhacements

• Some warnings were emitted even when --formatter was set to json.

GitHub issue: #8912

HTTP AuthN/AuthZ Backend Plugin

Bug Fixes

• AMQP 1.0 client connections were refused with this plugin.

GitHub issue: #9043

LDAP AuthN/AuthZ Backend Plugin

Bug Fixes

• AMQP 1.0 client connections were refused with this plugin.

GitHub issue: #9043

Dependency Upgrades

• osiris was upgraded to 1.6.2

Source Code Archives

To obtain source code of the entire distribution, please download the archive named rabbitmq-server-3.11.21.tar.xz
instead of the source tarball produced by GitHub.