I was recently working in an OpsMgr 2012 environment where there were problems adding a Performance widget because no counters were appearing for a custom group which had been created. To test this we performed the following two tests:

1) Created a group with two static members. We attempted to create add a Performance widget to a dashboards but the counters initially did not appear. We left the wizard to add the widget, re-tried and a minute later the counters appeared.

2) Created a group with two dynamic members. We attempted to create add a Performance widget to a dashboards but the counters initially did not appear. We left the wizard to add the widget, re-tried and a minute later the counters appeared.

Below is what appeared when initially trying to add performance counters for the widget:

image

After waiting another minute and re-trying by re-adding the group and performance counters now appear.

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Summary: Trying to add a Performance widget but no counters are appearing? First validate that the group is defined correctly and displays the members that you expect, then give it a few minutes if you have just created the group prior to adding the performance counters to the Performance widget.