It’s called the Activity Skyline Chart Apparently. And in finding that I found that this was already loosely requested as a feature long ago. I checked Custom Charts and while there is a Skyline as FTP%, it is far from what I was looking for. I’d be very happy if this was shown in the charts stack, or as a scalable pop-up like the map. It is generally a good representation of the intervals, so I could imagine that it could even replace the current interval highlighting in the future @eva