{
"AWS/RDS": {
      "dimensions": [
	    {
			"key" : "DbClusterIdentifier"
		},
		{
			"key" : "EngineName"
		}
	],
	"tags":[
	  {
	     "key": "rds:dbcluster"
	  }
	],
    "metrics": [
	  {
        "id": 1,
        "metric_name": "VolumeBytesUsed"
      },
      {
       "id": 2,
        "metric_name": "VolumeReadIOPs"
      },
      {
        "id": 3,
        "metric_name": "VolumeWriteIOPs"
      }
	  ]
	}
}