Today, 30-04-2020 starting with 14:00 EEST( 04:00 PDT/PST) for 2 hours, we'll be performing a WordPress upgrade on all production and development instances. During this time, the wp-admin can become inaccessible for brief periods of time while the new version is applied. The public sites will not be affected and they will work normally. For any inquiries during this time don't hesitate to contact us at firstname.lastname@example.org
This maintenance will affect all sites, including the newly upgrade GKE sites.