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## RabbitMQ 4.0.5
RabbitMQ `4.0.5` is a maintenance release in the `4.0.x` [release series](https://www.rabbitmq.com/release-information).
Starting June 1st, 2024, community support for this series will only be provided to [regularly contributing users](https://github.com/rabbitmq/rabbitmq-server/blob/main/COMMUNITY_SUPPORT.md) and those
who hold a valid [commercial support license](https://tanzu.vmware.com/rabbitmq/oss).
It is **strongly recommended** that you read [4.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.0.1)
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](https://www.rabbitmq.com/docs/which-erlang) 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](https://github.com/rabbitmq/rabbitmq-server/tree/v4.0.x/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](https://github.com/rabbitmq/rabbitmq-server/pull/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](https://github.com/rabbitmq/rabbitmq-server/issues/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 issue: [#12816](https://github.com/rabbitmq/rabbitmq-server/issues/12816), [#12904](https://github.com/rabbitmq/rabbitmq-server/pull/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](https://github.com/rabbitmq/rabbitmq-server/pull/12888)
* Peer discovery resilience improvements.
GitHub issues: [#12801](https://github.com/rabbitmq/rabbitmq-server/pull/12801), [#12809](https://github.com/rabbitmq/rabbitmq-server/pull/12809)
* Deadlettering of some messages could result in an exception.
GitHub issue: [#12933](https://github.com/rabbitmq/rabbitmq-server/issues/12933), [#12938](https://github.com/rabbitmq/rabbitmq-server/pull/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](https://github.com/rabbitmq/rabbitmq-server/issues/12776)
* Definition export files now have additional "type" markers that help distinguish a cluster-wide definition file from
that of a single virtual host.
GitHub issue: [#12835](https://github.com/rabbitmq/rabbitmq-server/issues/12835)
### Prometheus Plugin and Grafana Dashboards
#### Enhancements
* Two new stream metrics for streams.
Contributed by @gomoripeti and @markus812498.
GitHub issue: [#12765](https://github.com/rabbitmq/rabbitmq-server/pull/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](https://github.com/rabbitmq/rabbitmq-server/pull/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](https://github.com/rabbitmq/rabbitmq-server/pull/12797)
* When a logged in user's JWT token was refreshed, the user identity displayed in the UI was changed.
GitHub issue: [#12818](https://github.com/rabbitmq/rabbitmq-server/pull/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](https://github.com/rabbitmq/rabbitmq-server/pull/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](https://www.rabbitmq.com/docs/cluster-formation#node-health-checks-and-cleanup)).
GitHub issue: [#12809](https://github.com/rabbitmq/rabbitmq-server/pull/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](https://www.rabbitmq.com/docs/cluster-formation#node-health-checks-and-cleanup)).
GitHub issue: [#12809](https://github.com/rabbitmq/rabbitmq-server/pull/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](https://www.rabbitmq.com/docs/cluster-formation#node-health-checks-and-cleanup)).
GitHub issue: [#12809](https://github.com/rabbitmq/rabbitmq-server/pull/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](https://www.rabbitmq.com/docs/cluster-formation#node-health-checks-and-cleanup)).
GitHub issue: [#12809](https://github.com/rabbitmq/rabbitmq-server/pull/12809)
### Dependency Changes
* `osiris` was upgraded to [`1.8.5`](https://github.com/rabbitmq/osiris/releases)
## 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.
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