Cluster Registration Internals

Detailed analysis of the registration process for clusters. This shows the interaction of controllers, resources and service accounts during the registration of a new downstream cluster or the local cluster. It's important to note that there are multiple ways to start this:

• Creating a bootstrap config. Fleet does this for the local agent.
• Creating a Cluster resource with a kubeconfig. Rancher does this for downstream clusters. See manager-initiated registration.
• Create a ClusterRegistrationToken resource, optionally create a Cluster resource for a pre-defined (clientID) cluster. See agent-initiated registration.