***Alerting**: Add alert message to webhook notifications [#6807](https://github.com/grafana/grafana/issues/6807)
***PNG Rendering**: Fix for server side rendering when using non default http addr bind and domain setting [#6813](https://github.com/grafana/grafana/issues/6813)
***PNG Rendering**: Fix for server side rendering when setting enforce_domain to true [#6769](https://github.com/grafana/grafana/issues/6769)
***Webhooks**: Add content type json to outgoing webhooks [#6822](https://github.com/grafana/grafana/issues/6822)
