We built up a monitoring system based on Heapster, which is maintained by the Kubernetes group. Yet, several tools and platforms focusing on container cluster have sprung up to support the community, such as Prometheus (https://prometheus.io). On the other hand, public clouds may have run daemons on VM for grabbing the metrics by default, and provided services for corresponding actions. We don't have to build one within the cluster. Next, we are going to introduce the monitoring method on AWS and GCP. You may wish to check Chapter 6, Building Kubernetes on AWS, and Chapter 7, Building Kubernetes on GCP, to build a cluster and learn more concepts.