* **Templating**: Make $__interval and $__interval_ms global built in variables that can be used in by any datasource (in panel queries), closes [#7190](https://github.com/grafana/grafana/issues/7190), closes [#6582](https://github.com/grafana/grafana/issues/6582)
* **S3 Image Store**: External s3 image store (used in alert notifications) now support AWS IAM Roles, closes [#6985](https://github.com/grafana/grafana/issues/6985), [#7058](https://github.com/grafana/grafana/issues/7058) thx [@mtanda](https://github.com/mtanda)
* **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)
* **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)
* **Alerting**: Better information about why an alert triggered [#7035](https://github.com/grafana/grafana/issues/7035)
* **LINE**: Add LINE as alerting notification channel [#7301](https://github.com/grafana/grafana/pull/7301), thx [@huydx](https://github.com/huydx)
* **Elasticsearch**: Support for Min Doc Count options in Terms aggregation [#7324](https://github.com/grafana/grafana/pull/7324), thx [@lpic10](https://github.com/lpic10)
* **Elasticsearch**: Term aggregation limit can now be changed in template queries [#7112](https://github.com/grafana/grafana/issues/7112), thx [@FFalcon](https://github.com/FFalcon)
* **LINE**: Adds image to notification message [#7417](https://github.com/grafana/grafana/pull/7417), thx [@Erliz](https://github.com/Erliz)
* **Dataproxy**: Only allow get that begins with api/ to access Prometheus [#7459](https://github.com/grafana/grafana/pull/7459), thx [@mtanda](https://github.com/mtanda)
* **Hipchat**: Adds support for sending alert notifications to hipchat [#6451](https://github.com/grafana/grafana/issues/6451), thx [@jregovic](https://github.com/jregovic)
## Minor Enhancements
* **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)
* **Elasticsearch**: Support for Min Doc Count options in Terms aggregation [#7324](https://github.com/grafana/grafana/pull/7324), thx [@lpic10](https://github.com/lpic10)
* **Elasticsearch**: Term aggregation limit can now be changed in template queries [#7112](https://github.com/grafana/grafana/issues/7112), thx [@FFalcon](https://github.com/FFalcon)
* **Graph**: Add full series name as title for legends. [#7493](https://github.com/grafana/grafana/pull/7493), thx [@kolobaev](https://github.com/kolobaev)
* **Table**: Add a message when queries returns no data. [#6109](https://github.com/grafana/grafana/issues/6109), thx [@xginn8](https://github.com/xginn8)
* **Graph**: Set max width for series names in legend tables. [#2385](https://github.com/grafana/grafana/issues/2385), thx [@kolobaev](https://github.com/kolobaev)
* **Database**: Allow max db connection pool configuration [#7427](https://github.com/grafana/grafana/issues/7427), thx [@huydx](https://github.com/huydx)
* **Datasources** Delete datsource by name [#7476](https://github.com/grafana/grafana/issues/7476), thx [@huydx](https://github.com/huydx)
* **Dataproxy**: Only allow get that begins with api/ to access Prometheus [#7459](https://github.com/grafana/grafana/pull/7459), thx [@mtanda](https://github.com/mtanda)