Per GLEP67, only projects and people can maintain packages. And was it really desired for mirror-admin@ to maintain anything? www-apps/mirmon is the package.
No idea if it was desired, but right now noone doing mirror stuff (=me) maintains packages. So feel free to drop it to webapps or m-n
@web-apps, are you interested in mirmon or should I move it to maintainer-needed?
Now in maintainer-needed@, mail to g-dev sent.