Hi,

First sorry to not use the correct terminology.

In the android example trace, some tracks (for example com.google.camera...) have a "summary track" (reflecting somehow their children activity)

When you click on this track, you see all their children particular track.

I was checking the doc on how to create this summary / children overview or the parent track (aka picture 1) using protobuff format, but I was not able to find any information. By default, the UI just generate a "black" track (as for example the "FtraceEvent").

Sorry for the dumb question,

Thanks!