***Optimzation**: Never issue refresh event when Grafana tab is not visible [#7218](https://github.com/grafana/grafana/issues/7218), thx [@mtanda](https://github.com/mtanda)
***Browser History**: Browser back/forward now works time ranges / zoom, [#7259](https://github.com/grafana/grafana/issues/7259)
***SingleStat**: Implements diff aggregation method for singlestat [#7234](https://github.com/grafana/grafana/issues/7234), thx [@oliverpool](https://github.com/oliverpool)
***Dataproxy**: Added setting to enable more verbose logging in dataproxy [#7209](https://github.com/grafana/grafana/pull/7209), thx [@Ricky-N](https://github.com/Ricky-N)
## Bugfixes
***Alerting**: Fixes missing support for no_data and execution error when testing alerts [#7149](https://github.com/grafana/grafana/issues/7149)
