There are at least 3 different names for active check helpers:
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Core statistics: Check Helper Usage
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Global Settings -
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the alert of “OMD Performance” or rather perfdata - “Generic helper usage” (however, in an alert, I think it is “Check Helper Usage” again
Usually I think it is a bad idea to come up with yet another term, so maybe stick with “generic helper usage”? “Check helper usage” seems like a bad choice, as it is hard to distinguish from “Checkmk helper usage” oder “Checker helper usage” 
(Also 
