I hope one of the things Google learns in the post mortem is that the next day summary should clearly include that a full post mortem is coming in the next few days or however long.
Half the people in this thread are overlooking that fact and going into outrage mode.
Some examples:
https://status.cloud.google.com/incident/cloud-networking/18...
https://status.cloud.google.com/incident/cloud-pubsub/19001
https://status.cloud.google.com/incident/cloud-networking/18...
https://status.cloud.google.com/incident/cloud-networking/18...
https://status.cloud.google.com/incident/compute/18012
Given that this was a multi-region outage that lasted several hours and impacted a substantial number of services, I'd expect a detailed postmortem to follow.