changelog: note for #9596

CHANGELOG.md

@@ -11,6 +11,8 @@
 
 ## New Features
 * **Data Source Proxy**: Add support for whitelisting specified cookies that will be passed through to the data source when proxying data source requests [#5457](https://github.com/grafana/grafana/issues/5457), thanks [@robingustafsson](https://github.com/robingustafsson)
+* **Postgres/MySQL**: add __timeGroup macro for mysql [#9596](https://github.com/grafana/grafana/pull/9596), thanks [@svenklemm](https://github.com/svenklemm)
+
 
 
 ## Tech