Initial 3.12.7 release notes

(cherry picked from commit b74859d)

Author: michaelklishin

release-notes/3.12.7.md

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+RabbitMQ `3.12.7` is a maintenance release in the `3.12.x` [release series](https://www.rabbitmq.com/versions.html).
+**All users are encouraged to skip this version in favor of [`3.12.6`](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.12.6)**.
+
+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 `26.1.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 Server
+
+#### Bug Fixes
+
+ * `default_policies.*.queue_pattern` definition in `rabbitmq.conf` was incorrectly parsed.
+
+   Contributed by @SimonUnge (AWS).
+
+   GitHub issue: [#9545](https://github.com/rabbitmq/rabbitmq-server/pull/9545)
+
+#### Enhancements
+
+ * Classic queue storage version is now a supported key for [operator policies](https://rabbitmq.com/parameters.html#operator-policies).
+
+   GitHub issue: [#9548](https://github.com/rabbitmq/rabbitmq-server/pull/9548)
+
+   Contributed by @SignalWhisperer (AWS).
+
+
+## Management Plugin
+
+### Enhancements
+
+ * `DELETE /api/queues/{vhost}/{name}` now can delete exclusive queues.
+
+   GitHub issue: [#8758](https://github.com/rabbitmq/rabbitmq-server/issues/8758)
+
+ * Key supported by operator policies are now grouped by queue type in the UI.
+
+   GitHub issue: [#9544](https://github.com/rabbitmq/rabbitmq-server/pull/9544)
+
+
+## MQTT Plugin
+
+### Enhancements
+
+ * Improved data safety for confirms in environments where the plugin uses classic queues.
+
+   GitHub issue: [#9530](https://github.com/rabbitmq/rabbitmq-server/pull/9530)
+
+
+## JMS Topic Exchange Plugin
+
+#### Bug Fixes
+
+ * Recovery of bindings of durable queues bound to a transient JMS topic exchange failed.
+
+   GitHub issue: [#9533](https://github.com/rabbitmq/rabbitmq-server/issues/9533)
+
+
+## Sharding Plugin
+
+#### Bug Fixes
+
+ * Recovery of bindings of durable queues bound to a transient `x-modulo-hash` exchange failed.
+
+   GitHub issue: [#9533](https://github.com/rabbitmq/rabbitmq-server/issues/9533)
+
+
+## Recent History Exchange Plugin
+
+#### Bug Fixes
+
+ * Recovery of bindings of durable queues bound to a transient recent history exchange failed.
+
+   GitHub issue: [#9533](https://github.com/rabbitmq/rabbitmq-server/issues/9533)
+
+
+## Dependency Upgrades
+
+None in this release.
+
+
+## Dependency Upgrades
+
+None in this release.
+
+## Source Code Archives
+
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.12.7.tar.xz`
+instead of the source tarball produced by GitHub.