4.0.6 release notes
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Michael Klishin
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## RabbitMQ 4.0.6
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RabbitMQ `4.0.6` 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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* When a quorum queue leader has changed, followers were not always notified of
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unapplied [for/by them] log commands.
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GitHub issue: [#13095](https://github.com/rabbitmq/rabbitmq-server/pull/13095)
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* Default cluster formation timeout with [Khepri](https://www.rabbitmq.com/docs/metadata-store) now matches that of Mnesia (5 minutes by default).
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Discovered and reported by @evolvedlight.
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GitHub issue: [#13195](https://github.com/rabbitmq/rabbitmq-server/pull/13195)
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* When stream consumer was cancelled, an [internal event]() was not emitted.
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GitHub issues: [#13085](https://github.com/rabbitmq/rabbitmq-server/pull/13085), [#9356](https://github.com/rabbitmq/rabbitmq-server/pull/9356), [#13097](https://github.com/rabbitmq/rabbitmq-server/pull/13097)
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* Stream consumer metrics were not cleared when its respective connection was closed.
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GitHub issue: [#13086](https://github.com/rabbitmq/rabbitmq-server/pull/13086)
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* Quorum queues could return a list of members (replicas) with duplicates in some cases.
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GitHub issue: [#13168](https://github.com/rabbitmq/rabbitmq-server/pull/13168)
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* Classic queues with priorities could run into an exception.
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GitHub issue: [#13088](https://github.com/rabbitmq/rabbitmq-server/pull/13088)
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* Corrected a log message.
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GitHub issue: [#13155](https://github.com/rabbitmq/rabbitmq-server/pull/13155)
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#### Enhancements
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* A new mechanism for protecting a virtual host from deletion using metadata.
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GitHub issues: [#12772](https://github.com/rabbitmq/rabbitmq-server/issues/12772), [#13017](https://github.com/rabbitmq/rabbitmq-server/pull/13017)
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### CLI Tools
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#### Bug Fixes
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* `rabbitmqctl import_definitions` hanged when definitions were provided via the standard input
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instead of a file.
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GitHub issue: [#13157](https://github.com/rabbitmq/rabbitmq-server/issues/13157)
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#### Enhancements
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* [`rabbitmqadmin` v2](https://www.rabbitmq.com/docs/management-cli) has matured enough to recommend
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it over the original version of the tool
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* `rabbitmq-diagnostics ` CLI documentation was improved to clarify that all certificates
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discovered will be checked for expiration.
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GitHub issue: [#13038](https://github.com/rabbitmq/rabbitmq-server/pull/13038)
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* New health checks for [metadata store](https://www.rabbitmq.com/docs/metadata-store) initialization:
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1. `rabbitmq-diagnostics check_if_metadata_store_is_initialized`
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2. `rabbitmq-diagnostics check_if_metadata_store_is_initialized_with_data`
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GitHub issue: [#13169](https://github.com/rabbitmq/rabbitmq-server/pull/13169)
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### Prometheus Plugin
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#### Bug Fixes
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* Improved metric description.
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GitHub issue: [#13178](https://github.com/rabbitmq/rabbitmq-server/pull/13178)
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### Management Plugin
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#### Bug Fixes
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* Pagination-related sections of the HTTP API reference were clarified to explain
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that the maximum page size cannot exceed 500.
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GitHub issue: [#13042](https://github.com/rabbitmq/rabbitmq-server/issues/13042)
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* Empty `channel_details` objects are now serialized as empty objects and not empty arrays.
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GitHub issue: [#13091](https://github.com/rabbitmq/rabbitmq-server/pull/13091)
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#### Enhancements
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* New health checks for [metadata store](https://www.rabbitmq.com/docs/metadata-store) initialization:
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1. GET `/api/health/checks/metadata-store/initialized`
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2. GET `/api/health/checks/metadata-store/initialized/with-data`
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GitHub issue: [#13169](https://github.com/rabbitmq/rabbitmq-server/pull/13169)
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#### Deprecations
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* The original HTTP API One True Health Check™ is now a no-op. A comparable "mega health check"
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has long been deprecated in CLI tools and was made a no-op in `4.0.0`.
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This endpoint was using a [deprecated feature](https://www.rabbitmq.com/docs/deprecated-features): a classic non-exclusive transient (non-durable) queue.
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See [Health Checks](https://www.rabbitmq.com/docs/monitoring#health-checks) for modern focused alternatives.
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GitHub issue: [#13047](https://github.com/rabbitmq/rabbitmq-server/issues/13047)
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### Peer Discovery Consul Plugin
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#### Enhancements
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* `` is a new configuration setting that allows the backend to skip registration.
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This is useful when Consul is used for peer discovery but a different tool such as Nomad
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is used to keep track of the services and their registration, unregistration.
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Contributed by @frederikbosch.
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GitHub issue: [#13201](https://github.com/rabbitmq/rabbitmq-server/pull/13201)
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### Erlang AMQP 1.0 Client
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#### Bug Fixes
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* Purging an non-existing queue now returns a 404 response.
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GitHub issue: [#13148](https://github.com/rabbitmq/rabbitmq-server/pull/13148)
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### Dependency Changes
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* `ra` was upgraded to [`2.15.1`](https://github.com/rabbitmq/ra/releases)
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* `observer_cli` was upgraded to [`1.8.2`](https://github.com/zhongwencool/observer_cli/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-4.0.6.tar.xz`
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instead of the source tarball produced by GitHub.
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