7.2.2 changelog update (#28406)

CHANGELOG.md

@@ -53,6 +53,16 @@
 * **Variables**: Fixes so constants set from url get completed state. [#28257](https://github.com/grafana/grafana/pull/28257), [@hugohaggmark](https://github.com/hugohaggmark)
 * **Variables**: Prevent adhoc filters from crashing when they are not loaded properly. [#28226](https://github.com/grafana/grafana/pull/28226), [@mckn](https://github.com/mckn)
 
+# 7.2.2 (2020-10-21)
+
+### Features / Enhancements
+* **Instrumentation**: Add counters and histograms for database queries. [#28236](https://github.com/grafana/grafana/pull/28236), [@bergquist](https://github.com/bergquist)
+* **Instrumentation**: Add histogram for request duration. [#28364](https://github.com/grafana/grafana/pull/28364), [@bergquist](https://github.com/bergquist)
+* **Instrumentation**: Adds environment_info metric. [#28355](https://github.com/grafana/grafana/pull/28355), [@bergquist](https://github.com/bergquist)
+
+### Bug Fixes
+* **CloudWatch**: Fix custom metrics. [#28391](https://github.com/grafana/grafana/pull/28391), [@aknuds1](https://github.com/aknuds1)
+
 # 7.2.1 (2020-10-08)
 
 ### Features / Enhancements