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In a default openshift install, there is an unused project titled kube-system. It seems like openshift-infra is for things like metrics, default is for the router and registry, and openshift is for global templates.
What is the kube-system project used for though? I can't find any docs on it.

kube-system is the namespace for objects created by the Kubernetes system.
Typically, this would contain pods like kube-dns, kube-proxy, kubernetes-dashboard and stuff like fluentd, heapster, ingresses and so on.