}

// GetEtcdPeerAltNames builds an AltNames object for generating the etcd peer certificate.
// Hostname and `API.AdvertiseAddress` are included if the user chooses to promote the single node etcd cluster into a multi-node one (stacked etcd).
// The user can override the listen address with `Etcd.ExtraArgs` and add SANs with `Etcd.PeerCertSANs`.

			Config: certutil.Config{
				Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
			},
		},
		configMutators: []configMutatorsFunc{
			makeAltNamesMutator(pkiutil.GetEtcdPeerAltNames),
			setCommonNameToNodeName(),
		},
	}
}

// KubeadmCertEtcdHealthcheck is the definition of the cert used by Kubernetes to check the health of the etcd server.