We are in the process of upgrading the analytics infrastructure to Debian Stretch. Along the way, we will be moving (superset|turnilo|yarn|hue).wikimedia.org to new VMs. Superset and Turnilo will be upgraded as well.
I plan to move hue and yarn today or tomorrow, and superset and turnilo either this week or next. The move should be transparent to you all (you might have to re-log in). Just in case, if you encounter any issues please report them here: https://phabricator.wikimedia.org/T202011