Merge pull request #3950 from rabbitmq/mk-3.9.12-release-notes

3.9.12 release notes

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+RabbitMQ `3.9.12` is a maintenance release in the `3.9.x` release series.
+
+Please refer to the **Upgrading to 3.9** section from [v3.9.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.9.0) if upgrading from a version prior to 3.9.0.
+
+This release requires at least Erlang 23.2, and supports Erlang 24. [RabbitMQ and Erlang/OTP Compatibility Matrix](https://www.rabbitmq.com/which-erlang.html) has more details on Erlang version requirements for RabbitMQ.
+
+
+
+## Changes Worth Mentioning
+
+Release notes are kept under [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v3.9.x/release-notes).
+Contributors are encouraged to update them together with their changes. This helps with release automation and a more consistent release schedule.
+
+### Core Server
+
+#### Bug Fixes
+
+ * Work around a slow [Windows-specific memory leak in Erlang's `file:read_file/1`](https://github.com/erlang/otp/issues/5527).
+
+   GitHub issues: [#3936](https://github.com/rabbitmq/rabbitmq-server/pull/3936), [#3906](https://github.com/rabbitmq/rabbitmq-server/pull/3906)
+
+ * `log.file.rotation.date` pattern parser now supports more values and is closer to Lager in
+   RabbitMQ 3.7 and earlier releases.
+
+   GitHub issue: [#3831](https://github.com/rabbitmq/rabbitmq-server/issues/3831)
+
+ * User limits were ignored by definition import.
+
+   GitHub issue: [#3458](https://github.com/rabbitmq/rabbitmq-server/issues/3458)
+
+ * Stream coordinator could run into an exception in some scenarios.
+
+   GitHub issue: [#3908](https://github.com/rabbitmq/rabbitmq-server/pull/3908)
+
+ * On node shutdown, stopped applications were unintentionally logged at the error level.
+
+   GitHub issue: [#3900](https://github.com/rabbitmq/rabbitmq-server/issues/3900)
+
+#### Enhancements
+
+ * More efficient (up to 67% more) user addition and updates, including during definition import.
+
+   GitHub issue: [#3894](https://github.com/rabbitmq/rabbitmq-server/pull/3894)
+
+ * Authentiication and authorization backend exceptions could potentially leak user-provided credentials
+   to node log.
+
+   Contributed by @luos on behalf of [LKAB](https://www.lkab.com/).
+
+   GitHub issue: [#3903](https://github.com/rabbitmq/rabbitmq-server/pull/3903)
+
+ * When a non-existent stream offset is requested, the server will return a more appropriate
+   error code.
+
+   GitHub issue: [#3783](https://github.com/rabbitmq/rabbitmq-server/issues/3783)
+
+ * Stream operations that fail due to an unavailable leader now use a separate error code
+   from the case when the stream does not exist.
+
+   GitHub issue: [#3874](https://github.com/rabbitmq/rabbitmq-server/issues/3874)
+
+ * Deprecated classic health check is now less resource intensive (but still very intensive
+   compared to [modern alternatives](https://rabbitmq.com/monitoring.html#health-checks)).
+
+   GitHub issue: [#3905](https://github.com/rabbitmq/rabbitmq-server/pull/3905)
+
+ * Operator and regular policy merging now supports keys that use boolean values.
+   The operator value overrides the regular policy one.
+
+   GitHub issue: [#3880](https://github.com/rabbitmq/rabbitmq-server/pull/3880)
+
+ * Free disk space monitoring robustness improvements on Windows.
+
+   GitHub issue: [#3895](https://github.com/rabbitmq/rabbitmq-server/pull/3895)
+
+ * Unnamed parameters and policies in definition files will now be rejected
+   as invalid.
+
+   Contributed by @polaris-alioth.
+
+   GitHub issue: [#971](https://github.com/rabbitmq/rabbitmq-server/issues/971)
+
+
+### OAuth 2 Plugin
+
+#### Enhancements
+
+ * HTTPS client and related improvements for JWKS URLs.
+
+   Contributed by @anhanhnguyen on behalf of [LKAB](https://www.lkab.com/).
+
+   GitHub issue: [#3887](https://github.com/rabbitmq/rabbitmq-server/pull/3887)
+
+
+## Dependency Upgrades
+
+None in this release.
+
+
+## Source Code Archives
+
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.9.12.tar.xz`
+instead of the source tarball produced by GitHub.