In order for systems to measure anything or "throw off data", they must be instrumented to do so. This is true for cars, business processes, humans, anything.
There can be external measurement devices that observe the object but this is not the best. It is better for things to be instrumented and throw off their own data to the observer so the observation step can happen as part of the analysis.
Next time you build a system think about the needs for instrumentation, then you'll be more prepared to Collect, Analyze, Improve, and Control the system.
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