I share your sentiments as a developer. That was one of my motivations for starting work on this. I wanted developers to decide and develop some of these metric

I share your sentiments as a developer. That was one of my motivations for starting work on this. I wanted developers to decide and develop some of these metrics. I am not sure how exactly that looks like and I am hoping open source will help in figuring that out. In the meantime please check the faq. Developer productivity is not something that can be measured with simple metrics like time spent coding.