3.9.13 release notes

Author: michaelklishin

release-notes/3.9.13.md

@@ -15,11 +15,21 @@ Contributors are encouraged to update them together with their changes. This hel
 
 #### Bug Fixes
 
-TBD
+ * Disk space monitor now correctly parses output on (at least some) systems where non-ASCII characters are used in paths.
+
+   GitHub issue: [#3970](https://github.com/rabbitmq/rabbitmq-server/pull/3970)
+
+ * Stream leader election is now deterministic when cluster is undergoing a rolling upgrade.
+
+   GitHub issue: [#3967](https://github.com/rabbitmq/rabbitmq-server/pull/3967)
 
 #### Enhancements
 
-TBD
+ * Queue and binding [definition import](https://rabbitmq.com/definitions.html) can be delayed until a moment
+   when at least N nodes (e.g. three) have joined the cluster. This way imported quorum queues will have a desired
+   number of replicas from the start.
+
+   GitHub issue: [#3986](https://github.com/rabbitmq/rabbitmq-server/pull/3986)
 
 
 ## Dependency Upgrades