anchor.diff:  Periscope can work with any Hadoop 2/ YARN cluster provisioned with Apache Ambari, and supports any YARN application.
   
   ##Clusters [/clusters/{id}]
  -###Add a cluster to be monitored[POST]
  +###Add a cluster [POST]
   Add a Hadoop cluster to be monitored by Periscope. Note that Periscope does not require any pre-installation of components on cluster nodes. 
   To link a Hadoop cluster with Periscope the only required this is the Apache Ambari REST API endpoint.
   
  
positive.code: An alarm watches a metric over a specified time period, and used by one or more action or scaling policy based on the value of the metric relative to a given threshold over a number of time periods.
  
  ##Alarm [/clusters/{clusterId}/alarms]
  ###Create an alarm for a cluster [POST]
  
  + Parameters
      + clusterId (required String `clusterID`) ... The id of the cluster.
  
negative.code: A Hadoop YARN application is a workload submitted to a cluster. An application requests for resources from YARN Resource Manager. The resources are allocated as YARN containers.
  
  ##Applications [/clusters/{clusterId}/applications]
  ###List running applications and their resources [GET]
  
  + Parameters
      + clusterId (required String `clusterID`) ... The id of the cluster.
  