Ingressgateway envoy: what is the difference between the two outbound cluster config for each service?

1

for istio 1.4.2
dump the ingressgateway envoy cluster with istioctl proxy-config, eg : the grafana
what is the difference between outbound|3000||grafana.istio-system.svc.cluster.local and outbound|3000||grafana.istio-system.svc.cluster.local ?
why is it need two of them ?

 {
        "name": "outbound|3000||grafana.istio-system.svc.cluster.local",
        "type": "EDS",
        "edsClusterConfig": {
            "edsConfig": {
                "ads": {}
            },
            "serviceName": "outbound|3000||grafana.istio-system.svc.cluster.local"
        },
        "connectTimeout": "1s",
        "circuitBreakers": {
            "thresholds": [
                {
                    "maxConnections": 4294967295,
                    "maxPendingRequests": 4294967295,
                    "maxRequests": 4294967295,
                    "maxRetries": 4294967295
                }
            ]
        },
        "metadata": {
            "filterMetadata": {
                "istio": {
                    "config": "/apis/networking/v1alpha3/namespaces/istio-system/destination-rule/grafana"
                }
            }
        }
    },

    {
        "name": "outbound_.3000_._.grafana.istio-system.svc.cluster.local",
        "type": "EDS",
        "edsClusterConfig": {
            "edsConfig": {
                "ads": {}
            },
            "serviceName": "outbound_.3000_._.grafana.istio-system.svc.cluster.local"
        },
        "connectTimeout": "1s",
        "circuitBreakers": {
            "thresholds": [
                {
                    "maxConnections": 4294967295,
                    "maxPendingRequests": 4294967295,
                    "maxRequests": 4294967295,
                    "maxRetries": 4294967295
                }
            ]
        },
        "metadata": {
            "filterMetadata": {
                "istio": {
                    "config": "/apis/networking/v1alpha3/namespaces/istio-system/destination-rule/grafana"
                }
            }
        }
    },