docs: 7.4 what's new (Add expressions note) (#30446)

Also add a note that expression do not work with current alerting.

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>
Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>
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Kyle Brandt 2021-01-20 15:45:57 -05:00 committed by GitHub
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@ -75,7 +75,7 @@ _Server-side expressions_ is an experimental feature that allows you to manipula
The main use case is for [multi-dimensional](https://grafana.com/docs/grafana/latest/getting-started/timeseries-dimensions/#time-series-dimensions) data sources used with the upcoming next generation alerting, but expressions can be used with backend data sources and visualization as well.
> **Note:** Queries built with this feature may break with minor version upgrades until Grafana 8 is released.
> **Note:** Queries built with this feature might break with minor version upgrades until Grafana 8 is released. This feature does not work with the current Grafana alerting.
### Variable support in alert notifications