Switches to using counters so that the gauges don't cause any
information to be lost. Counters can be used to calculate all sorts of
metrics on Grafana. Which is also why min/avg/max logic is removed to
make things simple and small here.
Filtering for leaf nodes was missing from #32388, which means that even
the root done was reported, which made little sense for the bloatnet
data processing we want to do.
