On Monday, December 5 at 20:00 UTC, the OpenDev Collaboratory systems administrators will be migrating the lists.opendev.org and lists.zuul-ci.org mailing list sites from their existing Mailman 2.1.29 server to a shiny new Mailman 3.3.7 deployment. This maintenance window is expected to last no more than one hour. The key takeaways are as follows: * There will be a brief outage for the affected sites while DNS is updated and configuration, subscriber lists and message archives are imported, but incoming messages should correctly queue at the sender's end and arrive at the conclusion of our work * Because this is on a new server, there are new IP addresses from which list mail will be originating, 162.209.78.70 and 2001:4800:7813:516:be76:4eff:fe04:5423 * Moderation queues will not be copied to the new server, so moderators are encouraged to process any held messages prior to the migration time in order to avoid losing them * Anyone wishing to adjust their list subscriptions, or handle moderation or list configuration after the migration needs to use the Sign Up button on the Web page to create a new account; it will be linked to your imported roles as soon as you confirm by following a URL from an E-mail message the server sends you, and is global for all sites on the server so you only need to do this once * The software providing Web front-ends for list management and archive browsing is entirely new in Mailman v3 and therefore has a much different appearance, though we've added appropriate redirects and frozen copies of old archives in order to accommodate existing hyperlinks Once we smooth out any unanticipated rough patches with the new service, we'll schedule additional maintenance to migrate mailing list sites for other domains (Airship, Kata, OpenInfra, OpenStack, StarlingX). If you have any questions or concerns, feel free to follow up on the service-discuss mailing list or find us in the #opendev channel on the OFTC IRC network. -- Jeremy Stanley