going to try using dns authorization, then use certificate manager to generate a certificate and then add load balancer with that certificate in front of the cloudrun and update the cdns to use the generated certificate

Got this working properly after a lot of trial and error, reviewing docs, and reading a lot of source code (thank goodness it's all open source). The gist to pull this off is: • create dns authorizations • create one or more certificates from those authorizations • Then use the certificates in a certificate map passed into a load balancer ◦ url maps ◦ http proxy which forwards to https ◦ https proxy ◦ public ip address and a couple of global forwarding rules For the cdns, use a backing bucket and for cloudrun or cloudfunction use a backend service. Finally, add the dns authorization cnames to your dns provider.