www-golang: add metrics
www-golang: add metrics

Adds k8s.io/metrics to the go-get meta definitions.

kubernetes/k8s.io,thockin/k8s.io,kubernetes/k8s.io,thockin/k8s.io,thockin/k8s.io,kubernetes/k8s.io,kubernetes/k8s.io,thockin/k8s.io