It's all about measuring, and that's just the easy part. The hard part is focusing on what really matters.
I'll show you a bunch of metrics at different levels and from different perspectives, trying to make some sense out of them. I'll try to expand the current vision of what could be a metric, how it affects you and how you can choose your next ones.
The main goal is being able to understand what you need to monitor and improve in order to get better at what you're doing.