{
   "report_name" : "hdfs_under_replicated_blocks_report",
   "report_type" : "standard",
   "title" : "HDFS Under-Replicated Blocks",
   "vertical_label" : "Block Count",
   "series" : [
      { "metric": "dfs.FSNamesystem.UnderReplicatedBlocks", "color": "ff0000", "label": "Under-Replicated Blocks", 
        "line_width": "2", "type": "line" }
   ]
}