Status of some targets in Prometheus are DOWN while using kind

[engchina]

Some targets are down in prometheus while using kind. For some reason Prometheus fails to connect to those targets.

After investigation, the reason is that kube-controller-manager, kube-scheduler and etcd are listening on localhost.
And follow the document troubleshooting-prometheus, we know metricsBindAddress of kube-proxy should bind to 0.0.0.0, it's better to do it at create kind cluster step.

[david-cabelus-oracle]

Thanks. We will update the docs with instructions to bind at cluster creation time.