changelog: adds note for #14623

CHANGELOG.md

 # 6.0.0-beta2 (unreleased)
 
+### New Features
+* **AzureMonitor**: Enable alerting by converting Azure Monitor API to Go [#14623](https://github.com/grafana/grafana/issues/14623)
+
 ### Minor
 * **Alerting**: Adds support for images in pushover notifier [#10780](https://github.com/grafana/grafana/issues/10780), thx [@jpenalbae](https://github.com/jpenalbae)
 * **Graphite/InfluxDB/OpenTSDB**: Fix always take dashboard timezone into consideration when handle custom time ranges [#15284](https://github.com/grafana/grafana/issues/15284)