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Node Exporter

Node exporter provides machine-level metrics such as CPU, memory, filesystem, and network counters for every Kubernetes node.

Source paths​

  • lumie-infra/observability/node-exporter/argocd.yaml
  • lumie-infra/observability/node-exporter/helm-values.yaml

Runtime contract​

  • deployed as a DaemonSet in node-exporter
  • hostNetwork: true
  • hostPID: true
  • tolerates all nodes with operator: Exists
  • ServiceMonitor enabled with node metadata attached

Why the host settings matter​

Node exporter must see host namespaces and host networking to expose real machine metrics. That is why its security posture differs from ordinary app deployments.

Failure modes​

  • If a node lacks the DaemonSet pod, node-level dashboards and alerts lose visibility for that host immediately.
  • Because it runs with host visibility, network-policy assumptions for ordinary app pods do not apply here.
  • If the ServiceMonitor is missing, exporter pods keep running but Prometheus-based dashboards go blank.

Verification​

kubectl get applications.argoproj.io -n argocd node-exporter
kubectl get daemonsets -n node-exporter
kubectl get pods -n node-exporter -o wide
kubectl get servicemonitors -n node-exporter