onprem.example.org {
  root /etc/coredns
  hosts onprem.hosts
  log
  errors
}
gcp.example.org googleapis.com {
  forward . ${dns_forwarder_address}
  log
  errors
}
google.internal {
  hosts {
    169.254.169.254 metadata.google.internal
  }
}
. {
  forward . 8.8.8.8
  log
  errors
}