I say "ought to know" but we still screw this up with monitoring and logging all the damn time.
If you say "I'll measure all the things, then look for patterns" I promise that you'll find them. But it doesn't mean they mean anything. In a big enough data set, some patterns will exist from random chance, no matter how unlikely.
@iarna I remember a website which goal was to find correlations in dataset that have nothing to do with each other. Things like sales of fridge in US create work in Germany or consuming more cheese in France meant dryer weather in Amazon
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