***Prometheus**: Heatmap - fix unhandled error when some points are missing [#12484](https://github.com/grafana/grafana/issues/12484)
***Prometheus**: Add $__interval, $__interval_ms, $__range, $__range_s & $__range_ms support for dashboard and template queries [#12597](https://github.com/grafana/grafana/issues/12597)[#12882](https://github.com/grafana/grafana/issues/12882), thx [@roidelapluie](https://github.com/roidelapluie)
***Variables**: Skip unneeded extra query request when de-selecting variable values used for repeated panels [#8186](https://github.com/grafana/grafana/issues/8186), thx [@mtanda](https://github.com/mtanda)
***Postgres/MySQL/MSSQL**: New $__unixEpochGroup and $__unixEpochGroupAlias macros [#12892](https://github.com/grafana/grafana/issues/12892), thx [@svenklemm](https://github.com/svenklemm)
***Postgres/MySQL/MSSQL**: Add previous fill mode to $__timeGroup macro which will fill in previously seen value when point is missing [#12756](https://github.com/grafana/grafana/issues/12756), thx [@svenklemm](https://github.com/svenklemm)
***Postgres/MySQL/MSSQL**: Use floor rounding in $__timeGroup macro function [#12460](https://github.com/grafana/grafana/issues/12460), thx [@svenklemm](https://github.com/svenklemm)
***Postgres/MySQL/MSSQL**: Use metric column as prefix when returning multiple value columns [#12727](https://github.com/grafana/grafana/issues/12727), thx [@svenklemm](https://github.com/svenklemm)
