as of right now singer just has 2 services left:
contacts.wikimedia.org (going to rsync over to magnesium) RT-5018 (and it has been upgraded thanks to Jeff)
and
secure.wikimedia.org --> here's my attempt to move to (Apache) cluster: https://gerrit.wikimedia.org/r/#/c/60934/
everything else has been backed up and nuked or isn't needed anymore (/home/, /opt/, /root, /srv, ...)
also all other occurences of singer in DNS have been removed