In the toolforge kubernetes ingress setup there is a default route that should handle 404 errors, the fourohfour tool https://k8s-status.toolforge.org/namespaces/tool-fourohfour/
There should be some error somewhere, because when visiting a random page it returns 504 instead:
The message referring to openresty indicates that the 504 is produced by the nginx-ingress inside k8s.
Related documentation: https://wikitech.wikimedia.org/wiki/Portal:Toolforge/Admin/Kubernetes/Networking_and_ingress
