The MAINTAINERS.md file lists "Paul Gier pgier@redhat.com @pgier". However, that email address doesn't exist anymore (presumably because Paul doesn't work for RedHat anymore).

@pgier, could you update your email address?

In different news, I have invited you to the Prometheus GitHub org, but you haven't accepted the invitation. I tried to contact you by mail about it, which is the reason why I noticed your obsolete email address. (We want maintainers to be regular members of the GH org and not just "outside collaborators", which is your current role there.)