Virtual Kubelet is the multi-tenant Virtual Kubelet infrastructure of Koupleless. It has been refactored from the open-source Virtual Kubelet to support managing multiple Virtual Kubelets in a single process.

This is achieved through the implementation of the Tunnel interface, which allows custom resources to be disguised as K8S Nodes.

1. controller: Control plane components
2. tunnel: Operational pipeline support
3. virtual_kubelet: Original Virtual Kubelet logic, including node information maintenance, pod information maintenance, and other logic
4. vnode: Virtual Kubelet provider implementation