How to Monitor the Kubelet

Monitoring the Kubelet is crucial for maintaining the health and performance of Kubernetes clusters, as it ensures that containers within Pods are running smoothly and can affect the node's readiness state. The Kubelet operates on both control plane and worker nodes and is responsible for executing PodSpecs and maintaining the health of containers. When the Kubelet is down, the node enters a NotReady state, preventing the creation of new Pods and the restarting of failed workloads, thereby impacting application stability. To effectively monitor Kubelet, it is essential to focus on specific metrics such as the number of Kubelet instances, running Pods and containers, and the status of volume management and runtime operations. Prometheus can be configured to scrape these metrics, and tools like Sysdig Monitor can enhance the monitoring process with built-in dashboards and troubleshooting capabilities, allowing for faster identification and resolution of issues within the Kubernetes environment.