Merge pull request #11983 from rabbitmq/mergify/bp/v4.0.x/pr-11981

4.0.0-beta.4 release notes (backport #11981)

Author: michaelklishin

release-notes/4.0.0.md

@@ -1,18 +1,19 @@
-## RabbitMQ 4.0.0-beta.3
+## RabbitMQ 4.0.0-beta.4
 
-RabbitMQ `4.0.0-beta.3` is a preview of a new major release.
+RabbitMQ `4.0.0-beta.4` is a preview of a new major release.
 
 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 who hold a valid [commercial support license](https://tanzu.vmware.com/rabbitmq/oss).
 
 ## Highlights
 
 Some key improvements in this release are listed below.
 
- * [Khepri](https://www.youtube.com/watch?v=whVqpgvep90), an [alternative schema data store](https://github.com/rabbitmq/rabbitmq-server/pull/7206) developed to replace Mnesia,
-   has matured
+ * [Khepri](https://www.youtube.com/watch?v=whVqpgvep90), an [alternative schema data store](https://github.com/rabbitmq/rabbitmq-server/pull/7206) developed to replace Mnesia, has matured
  * AMQP 1.0 is now a core protocol that is always enabled. Its plugin is now a no-op that only exists to simplify upgrades.
  * The AMQP 1.0 implementation is now significantly more efficient: its peak throughput is [more than double than that of 3.13.x](https://github.com/rabbitmq/rabbitmq-server/pull/9022)
    on some workloads
+ * Efficient sub-linear [quorum queue recovery on node startup using checkpoints](https://github.com/rabbitmq/rabbitmq-server/pull/10637)
+ * Quorum queues now [support priorities](https://github.com/rabbitmq/rabbitmq-server/pull/10637) (but not exactly the same way as classic queues)
  * [AMQP 1.0 clients now can manage topologies](https://github.com/rabbitmq/rabbitmq-server/pull/10559) similarly to how AMQP 0-9-1 clients do it
  * The AMQP 1.0 convention (address format) used for interacting with with AMQP 0-9-1 entities [is now easier to reason about](https://github.com/rabbitmq/rabbitmq-server/pull/11618)
  * Mirroring (replication) of classic queues [was removed](https://github.com/rabbitmq/rabbitmq-server/pull/9815) after several years of deprecation. For replicated messaging data types,
@@ -85,8 +86,9 @@ TBD
 
  * Ra was [upgraded to `2.13.5`](https://github.com/rabbitmq/ra/releases)
  * Khepri was [upgraded to `0.14.0`](https://github.com/rabbitmq/khepri/releases)
+ * Cuttlefish was [upgraded to `3.4.0`](https://github.com/Kyorai/cuttlefish/releases)
 
 ## Source Code Archives
 
-To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-4.0.0-beta.3.tar.xz`
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-4.0.0-beta.4.tar.xz`
 instead of the source tarball produced by GitHub.