All issues have been resolved. This incident was caused by multiple encrypted tunnels between GCP and our legacy hosting provider failing due to issues with GCP's Cloud Routers. The migration of all services to GCP will be completed soon. We have added additional encrypted tunnels to other GCP regions to help insulate against a recurrence of this issue.
We apologize for some confusion. There were two incidents opened at the same time. We have deleted the second incident where the information on affected components was incorrect. Also, please ignore the performance graphs on this page for now. Due to a configuration error, performance metrics were disabled earlier today. We will be restoring them soon.
We have determined that the issue is with GCP Cloud Routers. BigCommerce engineers are attempting to route around this issue to restore the services remaining. Most of the stores using Storefront service have been restored.