The operations-dns-lint jenkins-bot check is broken since recently, so changes in the DNS repo get downvoted due to:
Failed to open GeoIP2 database '/usr/share/GeoIP/GeoIP2-City.mmdb': Error opening the specified MaxMind DB file
The puppet class "authdns::lint" is supposed to be installed on the slaves, it installs gdnsd and the maxmind dbs.
Related to the recent replacement of trusty?
example: https://integration.wikimedia.org/ci/job/operations-dns-lint/4457/console