We need to reboot irc.wikimedia.org (along many other hosts) to apply some long standing kernel updates. . Downtime is expected to be a few minutes as the reboot will happen along the reboot of the entire codfw ganeti infrastructure.
This normally would be easy and not require a ticket if not for the nature of the service. Hence filing this task as an advance notice. for interested parties. https://wikitech.wikimedia.org/wiki/Irc.wikimedia.org has some information as to the stuff that may need some extra help recovering for that, we should probably update whatever is needed before (and possibly after the reboot).
This will happen on June 21st.