This container can be pulled via:
  docker pull registry.opensuse.org/filesystems/ceph/octopus/images/ceph/grafana:6.3.5
  docker pull registry.opensuse.org/filesystems/ceph/octopus/images/ceph/grafana:6.3.5.2.8
  docker pull registry.opensuse.org/filesystems/ceph/octopus/images/ceph/grafana:latest
  docker pull registry.opensuse.org/filesystems/ceph/octopus/images/ceph/grafana:leap15.2.octopus

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.