The Metric Count tab in ATC Metric View appears to be showing counts from node which are greyed out, this behavior is different in on-prem 10.7 where metrics count is accurate
Release : SAAS
The existing "Metric Count" view is calculated based on Historical not Live data.
Enhancement : F131031 : Need Live "Metric Count" in the metric tree
Workaround:
Make sure to select the "Last 8 Minutes" (or 30 minutes) only