On reviewing https://gerrit.wikimedia.org/r/#/c/416346/ @hashar mentions that IP addresses are being collected (indefinitely?) and exposed to the public via https://logstash-beta.wmflabs.org/app/kibana
As things stand now this is a gross violation of the Labs Terms of Use as nowhere in any beta cluster project the warnings set out at https://wikitech.wikimedia.org/wiki/Wikitech:Labs_Terms_of_use#What_can_and_can%E2%80%99t_be_done_with_user_information? are displayed.
There's no need for the public to access private user information.
Volunteer administrators (those with deployment-tin access) may have a need to access such data for debug or abuse prevention.