Merge pull request #8227 from rabbitmq/mergify/bp/v3.12.x/pr-8226

3.12.0 release notes updates (backport #8226)

Author: michaelklishin

release-notes/3.12.0.md

@@ -4,14 +4,17 @@ RabbitMQ `3.12.0-rc.2` is a candidate of a new feature release.
 
 ## Highlights
 
-This release includes several new features and optimizations and graduates (makes mandatory) a number of feature flags.
+This release includes several new features, optimizations, and graduates (makes mandatory) a number of feature flags.
 
 The user-facing areas that have seen the biggest improvements in this release are
 
+ * [Optimizations](https://blog.rabbitmq.com/posts/2023/05/rabbitmq-3.12-performance-improvements/) for both quorum and classic queues: improved throughput, lower throughput variability, lower latency, lower memory footprint
+ * More mature and efficient implementation of (non-mirrored) classic queues v2 (CQv2)
+ * Classic queue lazy and non-lazy modes no longer apply: classic queues v2 always behave very similarly
+   to the lazy mode in earlier release series: moving data to disk aggressively and only keeping a subset of data in memory
  * Significantly [reduced MQTT and Web MQTT memory footprint per connection](https://blog.rabbitmq.com/posts/2023/03/native-mqtt/)
- * Reduced quorum queue memory footprint, improved throughput stability under load
- * Classic queue message store memory efficiency and footprint predictability
  * OAuth 2, OIDC, IDP support
+ * Even more configurability of the OAuth 2 plugin
 
 This release also features many internal API improvements in preparation to 4.0
 with [Khepri](https://www.youtube.com/watch?v=huT-zmXvfuM).
@@ -345,6 +348,18 @@ This release includes all bug fixes shipped in the `3.11.x` series.
 
 #### Enhancement
 
+ * It is now possible to configure (or strip) the scope prefix used by this plugin when translating
+   token scopes to RabbitMQ permissions.
+
+   To do so, override `auth_oauth2.scope_prefix` in `rabbitmq.conf`:
+
+   ``` ini
+   # "rabbitmq." is the default prefix
+   auth_oauth2.scope_prefix = rabbitmq.
+   ```
+
+   GitHub issue: [#8001](https://github.com/rabbitmq/rabbitmq-server/pull/8001)
+
  * Several variables (`{username}`, `{vhost}` and JWT claims that are single string values)
    now can be used (expanded) in topic operation authorization.