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Prometheus Kubelet ServiceMonitor

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kubectl get serviceMonitor -n monitoring kubelet -o yaml
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apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"monitoring.coreos.com/v1","kind":"ServiceMonitor","metadata":{"annotations":{},"labels":{"k8s-app":"kubelet"},"name":"kubelet","namespace":"monitoring"},"spec":{"endpoints":[{"bearerTokenFile":"/var/run/secrets/kubernetes.io/serviceaccount/token","honorLabels":true,"interval":"30s","port":"https-metrics","scheme":"https","tlsConfig":{"insecureSkipVerify":true}},{"bearerTokenFile":"/var/run/secrets/kubernetes.io/serviceaccount/token","honorLabels":true,"interval":"30s","metricRelabelings":[{"action":"drop","regex":"container_(network_tcp_usage_total|network_udp_usage_total|tasks_state|cpu_load_average_10s)","sourceLabels":["__name__"]}],"path":"/metrics/cadvisor","port":"https-metrics","scheme":"https","tlsConfig":{"insecureSkipVerify":true}}],"jobLabel":"k8s-app","namespaceSelector":{"matchNames":["kube-system"]},"selector":{"matchLabels":{"k8s-app":"kubelet"}}}}
  creationTimestamp: "2019-12-29T06:40:27Z"
  generation: 1
  labels:
    k8s-app: kubelet
  name: kubelet
  namespace: monitoring
  resourceVersion: "2602"
  selfLink: /apis/monitoring.coreos.com/v1/namespaces/monitoring/servicemonitors/kubelet
  uid: 327bae9c-d09c-4d00-b293-354870b19f91
spec:
  endpoints:
  - bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
    honorLabels: true
    interval: 30s
    port: https-metrics
    scheme: https
    tlsConfig:
      insecureSkipVerify: true
  - bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
    honorLabels: true
    interval: 30s
    metricRelabelings:
    - action: drop
      regex: container_(network_tcp_usage_total|network_udp_usage_total|tasks_state|cpu_load_average_10s)
      sourceLabels:
      - __name__
    path: /metrics/cadvisor
    port: https-metrics
    scheme: https
    tlsConfig:
      insecureSkipVerify: true
  jobLabel: k8s-app
  namespaceSelector:
    matchNames:
    - kube-system
  selector:
    matchLabels:
      k8s-app: kubelet

根据上面的namespaceSelector和selector

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kubectl get ep -n kube-system -l k8s-app=kubelet -o yaml
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apiVersion: v1
items:
- apiVersion: v1
  kind: Endpoints
  metadata:
    creationTimestamp: "2019-12-29T06:40:06Z"
    labels:
      k8s-app: kubelet
    name: kubelet
    namespace: kube-system
    resourceVersion: "2371"
    selfLink: /api/v1/namespaces/kube-system/endpoints/kubelet
    uid: 326583cc-3379-4883-8426-5a856c29c77e
  subsets:
  - addresses:
    - ip: 172.16.64.232
      targetRef:
        kind: Node
        name: k8s-node1
        uid: 09ffae8e-e3f1-456b-a398-7891487712da
    - ip: 172.16.64.233
      targetRef:
        kind: Node
        name: k8s-master
        uid: 774ddb3e-2c3c-4af8-8e1c-15b0c2c3b8c1
    - ip: 172.16.64.235
      targetRef:
        kind: Node
        name: k8s-node2
        uid: 7c1cc5f0-2b71-462a-907e-191b0d3ee819
    ports:
    - name: http-metrics
      port: 10255
      protocol: TCP
    - name: cadvisor
      port: 4194
      protocol: TCP
    - name: https-metrics
      port: 10250
      protocol: TCP
kind: List
metadata:
  resourceVersion: ""
  selfLink: ""
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