Having some authority on the subject because I've seen how both GCP and AWS handle their public status pages internally. They are manually updated by hand and are the last step in raising a large-scale issue.

Automated issue notifications get pushed to the Personal Health Dashboard for AWS and to my knowledge, GCP doesn't have automated status updates available to customer. (But AWS requires a support plan to gain access to their PHD, so it can be considered inaccessible to many as well).