I would like to present DX team another metric.
It is called "not wanting to work in a company that is insulting me with measures like metrics, spying on screens, squeezing every drop of sweat and exploiting its workers for already huge profit.
My last job change was exactly due to company acquisition by USA company that started to exploit everything work related, removing wfh, ruining life-job ballance,... And who leaves first? Those who can.
So you are not really measuring developer productivity but helping company get rid of most productive people, while all others stay.
That's exactly what they're introducing all of that crap for, to make people quit voluntarily, layoffs are more expensive...
I think metrics can be used for good. For example we are constantly try to improve our dev experience, but how do you know if you are improving anything? Developers are notably inaccurate in reporting efficiency. Unfortunately flying blind is not really an option when you need to justify paying for tools that claim to improve productivity.
This response is low on originality metric.
My only experience with GetDX has been filling in a questionaire once a quarter that asked stuff like "how often do you go to production"; I don't know if you work in a more hostile environment, but in my case it was always used to identify points to improve, not necessarily targets.