Describe the Datadog Cluster Agent?

The Cluster Agent is a specialized Kubernetes-aware component that sits between the Kubernetes API server and the per-node Datadog Agents, acting as a single, centralized point of contact for cluster-level data instead of every node querying the API server directly.

It relays cluster metadata (like pod labels and ownership) down to node Agents so they can enrich locally collected metrics, and it powers cluster-wide features like Cluster Checks, Horizontal Pod Autoscaling on custom metrics, and the Admission Controller.

Running one Cluster Agent (typically as a small Deployment) alongside the per-node Agent DaemonSet reduces load on the Kubernetes API server and centralizes RBAC permissions that would otherwise need to be granted to every node.

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