Istio.io/key-and-cert

 Opaque	                                 arbitrary user-defined data
kubernetes.io/service-account-token	ServiceAccount token
kubernetes.io/dockercfg	                serialized ~/.dockercfg file
kubernetes.io/dockerconfigjson	        serialized ~/.docker/config.json file
kubernetes.io/basic-auth	        credentials for basic authentication
kubernetes.io/ssh-auth	                credentials for SSH authentication
kubernetes.io/tls	                data for a TLS client or server
bootstrap.kubernetes.io/token	        bootstrap token data
istio.io/key-and-cert