在配置prometheus config map的时候，总是不知道那些source_labels的值到底有哪些。
以下source_label基于k8s v1.16.6，目前就看到有这些，以后发现再来加
__address__="10.20.128.2:7575"
__meta_kubernetes_endpoint_address_target_kind="Pod"
__meta_kubernetes_endpoint_address_target_name="graph-adapter-f7bc7b78b-dt8kr"
__meta_kubernetes_endpoint_node_name="n1.ha.env.lab.io"
__meta_kubernetes_endpoint_port_name="grpc"
__meta_kubernetes_endpoint_port_protocol="TCP"
__meta_kubernetes_endpoint_ready="true"
__meta_kubernetes_endpoints_name="graph-adapter-service"
__meta_kubernetes_namespace="cloudtogo-system"
__meta_kubernetes_pod_container_name="graph-adapter"
__meta_kubernetes_pod_container_port_name="grpc"
__meta_kubernetes_pod_container_port_number="7575"
__meta_kubernetes_pod_container_port_protocol="TCP"
__meta_kubernetes_pod_controller_kind="ReplicaSet"
__meta_kubernetes_pod_controller_name="graph-adapter-f7bc7b78b"
__meta_kubernetes_pod_host_ip="10.10.13.46"
__meta_kubernetes_pod_ip="10.20.128.2"
__meta_kubernetes_pod_label_app="graph-adapter"
__meta_kubernetes_pod_label_pod_template_hash="f7bc7b78b"
__meta_kubernetes_pod_labelpresent_app="true"
__meta_kubernetes_pod_labelpresent_pod_template_hash="true"
__meta_kubernetes_pod_name="graph-adapter-f7bc7b78b-dt8kr"
__meta_kubernetes_pod_node_name="n1.ha.env.lab.io"
__meta_kubernetes_pod_phase="Running"
__meta_kubernetes_pod_ready="true"
__meta_kubernetes_pod_uid="9bf545e8-ccb6-4942-86e3-7261fb1457f5"
__meta_kubernetes_service_annotation_kubectl_kubernetes_io_last_applied_configuration="{xx}"
__meta_kubernetes_service_annotationpresent_kubectl_kubernetes_io_last_applied_configuration="true"
__meta_kubernetes_service_label_app="graph-adapter"
__meta_kubernetes_service_labelpresent_app="true"
__meta_kubernetes_service_name="graph-adapter-service"
__metrics_path__="/metrics"
__scheme__="https"
job="kubernetes-apiservers"