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announce mailman downtime
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who to notify:

wikitech-l - https://lists.wikimedia.org/mailman/listinfo/wikitech-l
list of listadmins - https://lists.wikimedia.org/mailman/listinfo/listadmins
tech newsletter (Guillaume) - use the "user-notice" phab tag

maintenance window, max length: 4 hours ?

4 hours seems fair of a maintenance window. Looking at the plan we've drafted [need to make public :)]; we're just doing a 'what has changed' rsync after stopping mailman and holding exim. 4 hours seems more than safe with the lowered TTL.