{
   "report_name" : "io_report",
   "report_type" : "standard",
   "title" : "Disk I/O",
   "vertical_label" : "Bytes/sec",
   "series" : [
      { "metric": "io_nread", "color": "33cc33", "label": "Read", "line_width": "2", "type": "line" },
      { "metric": "io_nwrite", "color": "5555cc", "label": "Write", "line_width": "2", "type": "line" }
   ]
}

Add graph for I/O read and write, from mod_io
Add graph for I/O read and write, from mod_io
