{
   "report_name" : "jobtracker_heartbeats_report",
   "report_type" : "standard",
   "title" : "JobTracker Heartbeats",
   "vertical_label" : "Heartbeats/Sec",
   "series" : [
      { "metric": "mapred.jobtracker.heartbeats", "color": "ff0000", "label": "Heartbeats/Sec", 
        "line_width": "2", "type": "line" }
   ]
}