Is there a way to remove the applications not reporting/grayed out ones in triage map view in work station?
All APM supported releases.
No, You cannot unmount a metric. You can shut off a live metric, but if the metric is greyed out the only way to remove it from view is to let it expire, after a certain amount of time, the greyed out metrics will be removed from the UI. Or close the UI and reopen it.