Update: The maintenance window has begun. I'll send out one more notice when service availability is restored.

On Sun, Mar 14, 2021 at 11:17 AM Ryan Kemper <rkemper@wikimedia.org> wrote:
Hi all,

We'll be performing brief maintenance of Wikimedia Commons Query Service (https://wcqs-beta.wmflabs.org/) beginning at 2020-03-15 Mon 16:00 UTC. We expect service availability to be restored very quickly - on the order of 30 minutes or so. See also [1] [2]

[1] https://commons.wikimedia.org/wiki/Commons:SPARQL_query_service#Updates
[2] https://commons.wikimedia.org/wiki/Commons:Village_pump#Upcoming_Maintenance_for_Wikimedia_Commons_Query_Service