do you mean your system monitors do not reflect usage of flatpaks?
or are you looking for a some kind of breakdown of flatpak vs everything else?
because when i open a flatpak like onlyoffice, all my system monitors respond to the demands being placed on the system from CPU all the way down to disk usage.
I use a lot of flatpaks, which spawn different processes. They are detected, but systemmonitor doesnt tell me the CPU usage. It does tell the RAM usage
so when i start onlyoffice i don’t even see it listed by name on the processes tab… instead the activity seems to show up under DesktopEditors and editors_helper line items.