ganglia cpu user graph in dashing

gistfile1.rb

require 'httparty'
require 'addressable/uri'

# cpu_user url
uri_cpu = Addressable::URI.escape "http://localhost/ganglia/graph.php?r=hour&title=&vl=&x=&n=&hreg[]=compute&mreg[]=cpu_user&gtype=stack&glegend=hide&aggregate=1&embed=1&_=1410463742829&json=1"  

SCHEDULER.every '15s', :first_in => 0 do |job|
  points = []
  response = HTTParty.get(uri_cpu)
  response.each do |host|
    step = 0
    host["datapoints"].each do |val,secs|
      if val == "NaN"
        next
      end
      if points[step] == nil
        # -14400 for EST
        points << { x: secs-14400, y: val.round }
      else
        points[step][:y] += val.round
      end
      step += 1
    end
  end
  send_event('ganglia_cpu', { points: points })
end