"Last Attracted Developers" on https://wikimedia.biterg.io/app/kibana#/dashboard/Git-Demographics looks funny.
It says I started contributing today and has some authors listed without any "first commit date" (which probably should not happen).
Maybe a side effect of T161235: https://wikimedia.biterg.io shows 2017 contributors who are not listed in mediawiki-identities/wikimedia-affiliations.json. In any case, tracking issue here to allow (re)checking.