My team and I just open sourced a project today and we faced the same question. It's not sufficient to track downloads or even how many people clone; what you really want to know is actual usage (i.e. did they actually use the software, followed a guide/example in the docs). If you write a guide and reward users for completing a step, you'll at least get some data and that's what we intend to do.
Very cool! So basically providing a way to track how users are learning to use the project?
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