hzhang4-sc

This works for core-dns ``` - job_name: 'kube-dns' scheme: http kubernetes_sd_configs: - role: pod selectors: - role: "pod" label: "k8s-app=kube-dns" relabel_configs: - source_labels: [__meta_kubernetes_pod_container_name] action: keep regex: coredns - source_labels:...