This is a nice idea, and amazing execution on this. Really excited to see how this picks up.

But here are my concerns with the Git contributions to reward performance.

A company I interned at installed a Git history analysis tool, and used stats from that in 1:1s and performance reviews.

About a month after I joined, I had one such 1:1 with my manager. He was like, "Congratulations! You made 53% of all contributions to frontend last month. You're our star performer."

I wasn't. I was responsible for upgrading our frontend from React 15 to React 16. Most of the changes that happened were thanks to the Codemod, and a lot of find / replace magic.