4.0.5 release notes
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Michael Klishin
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RabbitMQ `4.0.4` is a maintenance release in the `4.0.x` [release series](https://www.rabbitmq.com/release-information).
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It was re-tagged (but not rebuilt) to [`bdb30ca`](https://github.com/rabbitmq/rabbitmq-server/commit/bdb30ca0edc7065a5be58decb4714d2488ce7362) after its original release on Nov 21, 2024.
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Packages were not rebuilt, only the tag was incorrect.
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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
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who hold a valid [commercial support license](https://tanzu.vmware.com/rabbitmq/oss).
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## RabbitMQ 4.0.5
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RabbitMQ `4.0.5` is a maintenance release in the `4.0.x` [release series](https://www.rabbitmq.com/release-information).
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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
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who hold a valid [commercial support license](https://tanzu.vmware.com/rabbitmq/oss).
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It is **strongly recommended** that you read [4.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.0.1)
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in detail if upgrading from a version prior to `4.0.0`.
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### Minimum Supported Erlang Version
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This release requires Erlang 26 and supports Erlang versions up to `27.2.x`.
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[RabbitMQ and Erlang/OTP Compatibility Matrix](https://www.rabbitmq.com/docs/which-erlang) has more details on
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Erlang version requirements for RabbitMQ.
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Nodes **will fail to start** on older Erlang releases.
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## Changes Worth Mentioning
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Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v4.0.x/release-notes).
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### Core Broker
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#### Bug Fixes
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* Reintroduced transient flow control between classic queue replicas and AMQP 0-9-1 channels,
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MQTT connections.
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Flow control between these specific parts of the core were unintentionally
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removed in `4.0.0` together with classic queue mirroring.
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Contributed by @gomoripeti.
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GitHub issue: [#12907](https://github.com/rabbitmq/rabbitmq-server/pull/12907)
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* The feature that warns when deprecated features are used in the cluster had a false positive that treated (and reported) any queue
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as a "transient non-exclusive classic queue", even if the queue was of a different type, was not transient, and so on.
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GitHub issue: [#12802](https://github.com/rabbitmq/rabbitmq-server/issues/12802)
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* AMQP 1.0 clients with close to peak consumption rates with a high `max_link_creadit` setting could run into an exception
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because RabbitMQ could set the incoming window size to a negative value.
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GitHub issue: [#12816](https://github.com/rabbitmq/rabbitmq-server/issues/12816), [#12904](https://github.com/rabbitmq/rabbitmq-server/pull/12904)
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* AMQP 0-9-1 channel exception generator could not handle entity names (say, queue or stream names)
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that contained non-ASCII characters.
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This affected applications that use passive queue declarations, such as the Shovel plugin.
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Contributed by @bpint.
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GitHub issue: [#12888](https://github.com/rabbitmq/rabbitmq-server/pull/12888)
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* Peer discovery resilience improvements.
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GitHub issues: [#12801](https://github.com/rabbitmq/rabbitmq-server/pull/12801), [#12809](https://github.com/rabbitmq/rabbitmq-server/pull/12809)
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* Deadlettering of some messages could result in an exception.
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GitHub issue: [#12933](https://github.com/rabbitmq/rabbitmq-server/issues/12933), [#12938](https://github.com/rabbitmq/rabbitmq-server/pull/12938)
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#### Enhancements
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* For virtual hosts that have a [default queue type]() configured, the DQT value is now injected into
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queue definitions in exported definition documents.
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GitHub issue: [#12776](https://github.com/rabbitmq/rabbitmq-server/issues/12776)
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* Definition export files now have additional "type" markers that help distinguish a cluster-wide definition file from
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that of a single virtual host.
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GitHub issue: [#12835](https://github.com/rabbitmq/rabbitmq-server/issues/12835)
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### Prometheus Plugin and Grafana Dashboards
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#### Enhancements
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* Two new stream metrics for streams.
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Contributed by @gomoripeti and @markus812498.
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GitHub issue: [#12765](https://github.com/rabbitmq/rabbitmq-server/pull/12765)
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### Management Plugin
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#### Bug Fixes
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* Fixes a false positive that incorrectly reported deprecated feature use, specifically
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the use of non-exclusive transient classic queues.
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GitHub issue: [#12840](https://github.com/rabbitmq/rabbitmq-server/pull/12840)
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* `GET /api/overview` did not format empty cluster and node list tags as an empty JSON object,
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which was problematic for HTTP API clients with statically typed response data structures.
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GitHub issue: [#12797](https://github.com/rabbitmq/rabbitmq-server/pull/12797)
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* When a logged in user's JWT token was refreshed, the user identity displayed in the UI was changed.
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GitHub issue: [#12818](https://github.com/rabbitmq/rabbitmq-server/pull/12818)
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### OAuth 2 Plugin
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#### Bug Fixes
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* When a logged in user's JWT token was refreshed, the user identity displayed in the UI was changed.
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GitHub issue: [#12818](https://github.com/rabbitmq/rabbitmq-server/pull/12818)
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### AWS Peer Discovery Plugin
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#### Bug Fixes
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* Avoids an exception during automatic removal of cluster members that are
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no longer returned by peer discovery (an [opt-in feature](https://www.rabbitmq.com/docs/cluster-formation#node-health-checks-and-cleanup)).
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GitHub issue: [#12809](https://github.com/rabbitmq/rabbitmq-server/pull/12809)
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### Kubernetes Peer Discovery Plugin
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#### Bug Fixes
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* Avoids an exception during automatic removal of cluster members that are
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no longer returned by peer discovery (an [opt-in feature](https://www.rabbitmq.com/docs/cluster-formation#node-health-checks-and-cleanup)).
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GitHub issue: [#12809](https://github.com/rabbitmq/rabbitmq-server/pull/12809)
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### Consul Peer Discovery Plugin
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#### Bug Fixes
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* Avoids an exception during automatic removal of cluster members that are
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no longer returned by peer discovery (an [opt-in feature](https://www.rabbitmq.com/docs/cluster-formation#node-health-checks-and-cleanup)).
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GitHub issue: [#12809](https://github.com/rabbitmq/rabbitmq-server/pull/12809)
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### etcd Peer Discovery Plugin
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#### Bug Fixes
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* Avoids an exception during automatic removal of cluster members that are
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no longer returned by peer discovery (an [opt-in feature](https://www.rabbitmq.com/docs/cluster-formation#node-health-checks-and-cleanup)).
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GitHub issue: [#12809](https://github.com/rabbitmq/rabbitmq-server/pull/12809)
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### Dependency Changes
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* `osiris` was upgraded to [`1.8.5`](https://github.com/rabbitmq/osiris/releases)
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## Source Code Archives
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To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-4.0.5.tar.xz`
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instead of the source tarball produced by GitHub.
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