anchor.diff:  cause Cassandra disk usage to unpredictably increase.
   ====
   
  -The link:http://www.hawkular.org/docs/rest/rest-metrics.html[Hawkular Metrics
  -documentation] covers how to use the API, but there are a few differences when
  -dealing with the version of Hawkular Metrics configured for use on
  -{product-title}:
  +The link:http://www.hawkular.org/docs/rest/rest-metrics.html[Hawkular Metrics documentation] 
  +covers how to use the API, but there are a few differences when dealing with the
  +version of Hawkular Metrics configured for use on {product-title}:
   
   [[cluster-metrics-openshift-projects-and-hawkular-tenants]]
   === {product-title} Projects and Hawkular Tenants
  
positive.code: [[cluster-metrics-scaling-openshift-metrics-pods]]
  == Scaling {product-title} Metrics Pods
  
  One set of metrics pods (cassandra/hawkular/heapster) is able to monitor at
  least 10,000 pods.
  
  If there is a need to scale out {product-title} metrics pods, follow
  link:https://github.com/openshift/origin-metrics/blob/master/docs/cassandra_scaling.adoc[these
  instructions]
  
  If persistent storage was used to deploy {product-title} metrics, it is
  necessary to
  xref:../dev_guide/persistent_volumes.adoc#dev-guide-persistent-volumes[create
  a persistent volume (PV)] for the new Cassandra pod to use before scaling out
  the number of {product-title} metrics Cassandra pods. If Cassandra was deployed
  with dynamically provisioned PVs, this step is not necessary.
  
  To scale out the number of {product-title} metrics hawkular pods to two
  replicas, run:
  
  ====
  ----
  # oc scale -n openshift-infra --replicas=2 rc hawkular-metrics
  ----
  ====
  
  [IMPORTANT]
  ====
  Pay attention to system load on nodes where {product-title} metrics pods run.
  Use that information to determine if it is necessary to scale out a number of
  
negative.code: *Authorization* header.
  
  ifdef::openshift-origin[]
  [[cluster-metrics-accessing-heapster-directly]]
  == Accessing Heapster Directly
  
  Heapster has been configured to be only accessible via the
  