etcd_domain_name

raw details (from release v2.2.3):

{
  "name": "etcd_domain_name",
  "long": "etcd-domain-name",
  "required_if": "tower_storage\", \"etcd",
  "value_name": "DOMAIN",
  "default_value": "localhost",
  "takes_value": "true",
  "help": "domain name against which to verify the etcd server’s TLS certificate"
}