3.12.14 release notes

release-notes/3.12.14.md

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+RabbitMQ `3.12.14` is a maintenance release in the `3.12.x` [release series](https://www.rabbitmq.com/versions.html).
+
+This release [goes out of community support](https://www.rabbitmq.com/release-information) on June 1st, 2024.
+
+Please refer to the upgrade section from the [3.12.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.12.0)
+if upgrading from a version prior to 3.12.0.
+
+This release requires Erlang 25 and supports Erlang versions up to `26.2.x`.
+[RabbitMQ and Erlang/OTP Compatibility Matrix](https://www.rabbitmq.com/which-erlang.html) has more details on
+Erlang version requirements for RabbitMQ.
+
+
+### Minimum Supported Erlang Version
+
+As of 3.12.0, RabbitMQ requires Erlang 25. Nodes **will fail to start** on older Erlang releases.
+
+Users upgrading from 3.11.x (or older releases) on Erlang 25 to 3.12.x on Erlang 26
+(both RabbitMQ *and* Erlang are upgraded at the same time) **must** consult
+the [v3.12.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.12.0) first.
+
+
+## Changes Worth Mentioning
+
+Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v3.12.x/release-notes).
+
+### Core Broker
+
+#### Bug Fixes
+
+ * Quorum queues are now more defensive when acquiring file handles.
+
+   GitHub issue: [#10587](https://github.com/rabbitmq/rabbitmq-server/pull/10587)
+
+#### Enhancements
+
+ * There is now a way to configure default queue type globally (that is, not per virtual host)
+   in `rabbitmq.conf`:
+
+   ``` ini
+   # Built-in type aliases are "quorum", "classic", "stream"
+   default_queue_type = quorum
+   ```
+
+   Contributed by @SimonUnge.
+
+   GitHub issue: [#11165](https://github.com/rabbitmq/rabbitmq-server/pull/11165)
+
+
+ * `channel_max_per_node` is a new per-node limit that allows to put a cap on the number
+   of AMQP 0-9-1 channels that can be concurrently open by all clients connected to a node:
+
+   ``` ini
+   # rabbitmq.conf
+   channel_max_per_node = 5000
+   ```
+
+   This is a guardrail mean to protect nodes from [application-level channel leaks](https://www.rabbitmq.com/docs/channels#channel-leaks).
+
+   Contributed by @illotum.
+
+   GitHub issue: [#10754](https://github.com/rabbitmq/rabbitmq-server/pull/10754)
+
+ * [Definition import](https://www.rabbitmq.com/docs/definitions) did not handle a scenario where some virtual hosts did not have
+   the default queue type metadata key set.
+
+   GitHub issue: [#10897](https://github.com/rabbitmq/rabbitmq-server/pull/10897)
+
+
+### AMQP 1.0 Plugin
+
+#### Bug Fixes
+
+ * Safer AMQP 1.0 => AMQP 0-9-1 message durability property conversion.
+
+   GitHub issue: [#10568](https://github.com/rabbitmq/rabbitmq-server/pull/10568)
+
+
+### Management Plugin
+
+#### Bug Fixes
+
+ * Set default `sort` query parameter value for better compatibility with an external
+   Prometheus scraper. Note that the [built-in Prometheus plugin](https://www.rabbitmq.com/docs/prometheus)
+   is the recommended way of [monitoring](https://www.rabbitmq.com/docs/monitoring) RabbitMQ using Prometheus-compatible tools.
+
+   GitHub issue: [#10610](https://github.com/rabbitmq/rabbitmq-server/pull/10610)
+
+ * When a tab (Connections, Queues and Streams, etc) is switched, a table configuration pane
+   from the previously selected tab is now hidden.
+
+   Contributed by @ackepenek.
+
+   GitHub issue: [#10799](https://github.com/rabbitmq/rabbitmq-server/pull/10799)
+
+
+### JMS Topic Exchange Plugin
+
+#### Enhancements
+
+  * The plugin now stores its state on multiple nodes.
+
+    GitHub issue: [#11098](https://github.com/rabbitmq/rabbitmq-server/pull/11098)
+
+
+### Dependency Changes
+
+ * `cowboy` was updated to [`2.12.0`](https://ninenines.eu/docs/en/cowboy/2.12/guide/migrating_from_2.11/)
+
+## Source Code Archives
+
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.12.14.tar.xz`
+instead of the source tarball produced by GitHub.