RabbitMQ 4.0.5

RabbitMQ 4.0.5 is a maintenance release in the 4.0.x release series.

Starting June 1st, 2024, community support for this series will only be provided to regularly contributing users and those
who hold a valid commercial support license.

It is strongly recommended that you read 4.0 release notes
in detail if upgrading from a version prior to 4.0.0.

Minimum Supported Erlang Version

This release requires Erlang 26 and supports Erlang versions up to 27.2.x.
RabbitMQ and Erlang/OTP Compatibility Matrix has more details on
Erlang version requirements for RabbitMQ.

Nodes will fail to start on older Erlang releases.

Changes Worth Mentioning

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

Core Broker

Bug Fixes

• Reintroduced transient flow control between classic queue replicas and AMQP 0-9-1 channels,
  MQTT connections.

  Flow control between these specific parts of the core were unintentionally
  removed in 4.0.0 together with classic queue mirroring.

  Contributed by @gomoripeti.

  GitHub issue: #12907

• The feature that warns when deprecated features are used in the cluster had a false positive that treated (and reported) any queue
  as a "transient non-exclusive classic queue", even if the queue was of a different type, was not transient, and so on.

  GitHub issue: #12802

• AMQP 1.0 clients with close to peak consumption rates with a high max_link_creadit setting could run into an exception
  because RabbitMQ could set the incoming window size to a negative value.

  GitHub issues: #12816, #12904

• AMQP 0-9-1 channel exception generator could not handle entity names (say, queue or stream names)
  that contained non-ASCII characters.

  This affected applications that use passive queue declarations, such as the Shovel plugin.

  Contributed by @bpint.

  GitHub issue: #12888

• Peer discovery resilience improvements.

  GitHub issues: #12801, #12809

• Deadlettering of some messages could result in an exception.

  GitHub issue: #12933, #12938

Enhancements

• For virtual hosts that have a default queue type configured, the DQT value is now injected into
  queue definitions in exported definition documents.

  GitHub issue: #12776

• Definition export files now have an additional "type" markers that help distinguish a cluster-wide definition file from
  that of a single virtual host.

  GitHub issue: #12835

Prometheus Plugin and Grafana Dashboards

Enhancements

• Two new metrics for streams.

  Contributed by @gomoripeti and @markus812498.

  GitHub issue: #12765

Management Plugin

Bug Fixes

• Fixes a false positive that incorrectly reported deprecated feature use, specifically
  the use of non-exclusive transient classic queues.

  GitHub issue: #12840

• GET /api/overview did not format empty cluster and node list tags as an empty JSON object,
  which was problematic for HTTP API clients with statically typed response data structures.

  GitHub issue: #12797

• When a logged in user's JWT token was refreshed, the user identity displayed in the UI was changed.

  GitHub issue: #12818

OAuth 2 Plugin

Bug Fixes

• When a logged in user's JWT token was refreshed, the user identity displayed in the UI was changed.

  GitHub issue: #12818

AWS Peer Discovery Plugin

Bug Fixes

• Avoids an exception during automatic removal of cluster members that are
  no longer returned by peer discovery (an opt-in feature).

  GitHub issue: #12809

Kubernetes Peer Discovery Plugin

Bug Fixes

• Avoids an exception during automatic removal of cluster members that are
  no longer returned by peer discovery (an opt-in feature).

  GitHub issue: #12809

Consul Peer Discovery Plugin

Bug Fixes

• Avoids an exception during automatic removal of cluster members that are
  no longer returned by peer discovery (an opt-in feature).

  GitHub issue: #12809

etcd Peer Discovery Plugin

Bug Fixes

• Avoids an exception during automatic removal of cluster members that are
  no longer returned by peer discovery (an opt-in feature).

  GitHub issue: #12809

Dependency Changes

• osiris was upgraded to 1.8.5

Build Commit

293a4f6

Source Code Archives

To obtain source code of the entire distribution, please download the archive named rabbitmq-server-4.0.5.tar.xz
instead of the source tarball produced by GitHub.