Changelog: Add known issues for v6.2.3 (#17615)

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 # 6.2.3 (2018-06-17)
 
+### Known issues
+* **grafana-cli**: The argument `--pluginsDir` is not working.
+* **docker**: Due to above problem with grafana-cli the docker run will fail to start the container if you're installing plugins using the `GF_INSTALL_PLUGINS` environment variable. We have removed 6.2.3 tag from docker hub and latest tag now points to 6.2.2.
+
+More details in bug report: https://github.com/grafana/grafana/issues/17613
+
 ### Features / Enhancements
 * **AuthProxy**: Optimistic lock pattern for remote cache Set. [#17485](https://github.com/grafana/grafana/pull/17485), [@papagian](https://github.com/papagian)
 * **HTTPServer**: Options for returning new headers X-Content-Type-Options,  X-XSS-Protection and Strict-Transport-Security. [#17522](https://github.com/grafana/grafana/pull/17522), [@kylebrandt](https://github.com/kylebrandt)