[weee_username]

When I'm measuring developer performance I look at one stat: Do they make reasonable deadlines without generating a ton of bugs?

Why is this? Well, it's because the amount of tickets, code, or even time spent "logged in" doesn't matter. The only thing that matters to a business is if they can deliver on time so the product can keep moving forward and others aren't waiting for them.

[ramtatatam]

So you assume your devs are senior enough to come up with achievable deadlines even when they are under pressure. Such methodology will work in favor to senior people or people who can negotiate better time frames to deliver their bits.