I’m a big fan of caveman debugging. That is, using log statements to gather information and visualize a program’s control flow. But I only use it very tactically: I need this one piece of information. Add a log or two and see what I get. Once I solve the problem I take out the logs before sending the code out for review and checking it in. I consider caveman debugging different from the logging an app does to report its activity or health. This should be designed like any other feature, and not be dependent upon developers randomly scattering log statements around the code base.