I think you will find it was Kendo UI v2017.3.913 in 8.5 and now Kendo UI v2020.3.1021 in 8.6
On the new grid grouping feature, implementing custom group Headers and Footers is as a result of the new Kendo version. I am hoping this can lead to a more dynamic grouping layout where meaningful labels and data group sums or counts can be positioned to serve as drill-down reporting/presentation alternative.
The next trick is how to leverage this feature into something like this 🙂
