Kubernetes Cluster Autoscaler

Cluster Autoscaler is a key feature of Kubernetes, which automatically adjusts the number of nodes in a cluster based on resource requests from pods. It works alongside other autoscaling functionalities such as Horizontal Pod Autoscaler and Vertical Pod Autoscaler. It operates at the cluster level, while HPA and VPA operate at the pod level. The scaling process involves checking for pending pods, extending the cluster by launching a new node, registering it with the control plane, and allocating pending pods to the new node. However, CA has limitations, such as not considering CPU or memory usage and a delay in scaling up due to the cloud provider's response time.

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