promethes收集node_exporter数据不准

1 . 本来的ymal文件是如下, 这样的配置收集到内存，文件系统数据不准

 - job_name: 'kubernetes-node-exporter'
      scheme: http
      tls_config:
        ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
      bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
      kubernetes_sd_configs:
      - role: node
      relabel_configs:
      - action: labelmap
        regex: __meta_kubernetes_node_label_(.+)
      - source_labels: [__meta_kubernetes_role]
        action: replace
        target_label: kubernetes_role
      - source_labels: [__address__]
        regex: '(.*):10250'
        replacement: '${1}:9370'
        target_label: __address__

2. 改成如下的即可

- job_name: kubernetes-node-exporter
      scrape_interval: 30s
      scrape_timeout: 10s
      metrics_path: /metrics
      scheme: http
      bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
      tls_config:
        ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
      kubernetes_sd_configs:
      - role: endpoints
      relabel_configs:
      - source_labels: [__meta_kubernetes_service_label_k8s_app]
        separator: ;
        regex: node-exporter
        replacement: $1
        action: keep
      - source_labels: [__meta_kubernetes_endpoint_port_name]
        separator: ;
        regex: http
        replacement: $1
        action: keep
      - source_labels: [__meta_kubernetes_endpoint_address_target_kind, __meta_kubernetes_endpoint_address_target_name]
        separator: ;
        regex: Node;(.*)
        target_label: node
        replacement: ${1}
        action: replace
      - source_labels: [__meta_kubernetes_endpoint_address_target_kind, __meta_kubernetes_endpoint_address_target_name]
        separator: ;
        regex: Pod;(.*)
        target_label: pod
        replacement: ${1}
        action: replace
      - source_labels: [__meta_kubernetes_namespace]
        separator: ;
        regex: (.*)
        target_label: namespace
        replacement: $1
        action: replace
      - source_labels: [__meta_kubernetes_service_name]
        separator: ;
        regex: (.*)
        target_label: service
        replacement: $1
        action: replace
      - source_labels: [__meta_kubernetes_pod_name]
        separator: ;
        regex: (.*)
        target_label: pod
        replacement: $1
        action: replace
      - source_labels: [__meta_kubernetes_service_name]
        separator: ;
        regex: (.*)
        target_label: job
        replacement: ${1}
        action: replace
      - source_labels: [__meta_kubernetes_service_label_k8s_app]
        separator: ;
        regex: (.+)
        target_label: job
        replacement: ${1}
        action: replace
      - separator: ;
        regex: (.*)
        target_label: endpoint
        replacement: http
        action: replace