***Postgres**: Add delta window function to postgres query builder [#13925](https://github.com/grafana/grafana/issues/13925), thx [svenklemm](https://github.com/svenklemm)
***Elasticsearch**: Fix switching to/from es raw document metric query [#6367](https://github.com/grafana/grafana/issues/6367)
***Elasticsearch**: Fix deprecation warning about terms aggregation order key in Elasticsearch 6.x [#11977](https://github.com/grafana/grafana/issues/11977)
***Graph**: Render dots when no connecting line can be made [#13605](https://github.com/grafana/grafana/issues/13605), thx [@jsferrei](https://github.com/jsferrei)
***Table**: Fix CSS alpha background-color applied twice in table cell with link [#13606](https://github.com/grafana/grafana/issues/13606), thx [@grisme](https://github.com/grisme)
***Singlestat**: Fix XSS in prefix/postfix [#13946](https://github.com/grafana/grafana/issues/13946), thx [@cinaglia](https://github.com/cinaglia)
***Units**: New clock time format, to format ms or second values as for example `01h:59m`, [#13635](https://github.com/grafana/grafana/issues/13635), thx [@franciscocpg](https://github.com/franciscocpg)
