• Earlier required Heapster
• Only meant for auto scaling purposes, Not meant for monitoring the resources, use Kubelet /metrics/resource endpoint directly.
• With the installation of metrics server we can do kubectl top RESOURCE_TYPE to check the resource utilization.

References:

[1]: kubernetes-sigs/metrics-server: Scalable and efficient source of container resource metrics for Kubernetes built-in autoscaling pipelines. [2]: Kubernetes Metrics Server | metrics-server