Kubernetes Controllers, Kubernetes Authors, 2024 - The official documentation provides a foundational overview of Kubernetes controllers, explaining their purpose, the reconciliation loop, and how they maintain the desired state of the cluster.
Control Plane Components: kube-controller-manager, Kubernetes Authors, 2025 - This official documentation section details the kube-controller-manager, a core component that runs various controllers responsible for cluster-wide state management.
Kubernetes: Up & Running, Brendan Burns, Joe Beda, Kelsey Hightower, Lachlan Evenson, 2022 (O'Reilly Media) - An authoritative book by Kubernetes creators that offers a comprehensive explanation of Kubernetes architecture, including controllers, the declarative model, and the reconciliation process.