title: add auth or dissable /metrics endpoint for prometheus client
body: <p>I am using Prometheus on OpenShift platform. Authentication is handled by OpenShift for Prometheus and all its sub domains except /metrics endpoint. 
  It bypasses all authentication and shows Prometheus go client metrics plain texted.</p>
  
  <p>Is it possible to somehow force OpenShift authentication on prometheus/metrics endpoint or to disable that endpoint since I don't really need go client metrics?</p>
  
  <p>I know that node_exporters have flags to control certain collectors but I couldn't find it for Prometheus client itself. </p>