Google-managed certificate that never gets issued: CAA (pki.goog, letsencrypt.org), FAILED_NOT_VISIBLE and the right order
CAA with issue pki.goog and issue letsencrypt.org (or no CAA at all), A/AAAA pointing only to the load balancer IP, certificate attached to the target proxy, and up to 60 minutes. gcloud compute ssl-certificates describe shows the domainStatus that tells which of the three is failing.