I've been there.

If it happens too much, then the process is not working. Do you agree? If it happens occasionally, then it's just variance.

If it is important to a team to know about this variance, then I could imagine someone would think of measuring it, temporarily, to understand the situation. But not turn the whole thing into a process.

I've been on teams that transformed every little mistake into a lesson, burdening the whole team with cargo cult processes. Things we did because "once upon a time....". That's not healthy. I'm not implying that's your case, just showing another perspective.