Update changelog

Author: razvan

CHANGELOG.md

@@ -33,6 +33,7 @@ All notable changes to this project will be documented in this file.
   - The `runAsUser` and `runAsGroup` fields will not be set anymore by the operator
   - The defaults from the docker images itself will now apply, which will be different from 1000/0 going forward
   - This is marked as breaking because tools and policies might exist, which require these fields to be set
+- BREAKING: the JMX exporter has been an replaced with the built-in Prometheus servlet. The history pods do not expose metrics anymore ([#584])
 
 ### Fixed
 
@@ -59,6 +60,7 @@ All notable changes to this project will be documented in this file.
 [#574]: https://github.com/stackabletech/spark-k8s-operator/pull/574
 [#580]: https://github.com/stackabletech/spark-k8s-operator/pull/580
 [#575]: https://github.com/stackabletech/spark-k8s-operator/pull/575
+[#584]: https://github.com/stackabletech/spark-k8s-operator/pull/584
 
 ## [25.3.0] - 2025-03-21