Management likes to ask questions like, "How come I can't see the sum of all of those interfaces (or what have you) when you show them Perfstack graph. I have to say - "I can't, it doesn't do it." and typically followed by, "let me make Grafana do it." Which means you are making me work more than I should for something that should just be there. 
Or really on any widget. I need to be able to do math if I wish.
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