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I not too sure if the measuring activity days is really that useful as a metric for shipping the product.

The examples shows that it is measuring number of commits, number of files touched, and line of code added and deleted. It shows that the engineer is busy but busy doing what??

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Thanks for your reply yitchelle! The image only shows a part of the graph. When you click on the circle it shows all the activity in the concrete week and the impact of those tasks and their impact on the repository!

So yes, activity days show how busy is an engineer and what he/she's really doing!

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