anchor.diff:  
   |`*IMAGE_PREFIX*`
   |Specify prefix for metrics components. For example, for *openshift/origin-metrics-deployer:latest*, set prefix to *openshift/origin-*.
  +
  +|`*MODE*`
  +|Can be set to: *preflight* to perform validation before a deployment; *deploy* to perform an initial deployment; *refresh* to delete and redeploy all components but to keep persisted data and routes; *redeploy* to delete and redeploy everything (losing all data in the process); *validate* to re-run validations after a deployment.
  +
  +|`*IGNORE_PREFLIGHT*`
  +|Can be set to *true* to disable the preflight checks. This will allow the deployer to continue even if the preflight check has failed.
  +
  +|`*USER_WRITE_ACCESS*`
  +|If user accounts should be able to write metrics. Defaults to 'false' so that only Heapster can write metrics and not individual users. It is recommended to disable user write access, if enabled any user will be able to write metrics to the system which can affect performance and can cause Cassandra disk usage to unpredictably increase.
  +
   |===
   
   The only required parameter is `*HAWKULAR_METRICS_HOSTNAME*`. This value is
  
positive.code: ====
  If your {product-title} installation was originally performed on a version
  previous to v1.0.8, even if it has since been updated to a newer version, follow
  the instructions for node certificates outlined in Updating
  Master and Node Certificates. If the node certificate does not contain the IP
  address of the node, then Heapster will fail to retrieve any metrics.
  ====
  endif::[]
  
negative.code: When accessing Hawkular Metrics via the API, you will only be able to perform
  reads. Writing metrics has been disabled by default. If you want for individual
  users to also be able to write metrics, you will need to set the
  `*USER_WRITE_ACCESS*`
  xref:../install_config/cluster_metrics.adoc#deployer-template-parameters[deployer template parameter]
  to *true*.
  
  However, it is recommended to use the default configuration and only have
  metrics enter the system via Heapster. If write access is enabled, any user
  