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What does prometheus node exporter collects from within a pod? I was under impression that to collect node stats you absolutely need to be "outside" any container, i.e. using prometheus-k8s integration so that it pulls nodes stats from k8s api, not nodes themselves).

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The kube-state-metrics service runs as part of the kubernetes API and provides container metrics. It replaces heapster.

The node exporter runs as a daemonset on each node and provides node specific metrics like CPU, memory, disk IO, network IO, etc.

The node metrics comes from the node itself.

Not an expert, and this may have changed since I deployed this, but I based most of our deployment on the Prometheus helm chart.

The helm charts include this: https://github.com/helm/charts/tree/master/stable/prometheus...

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