How to set the auto scaling policy based upon memory

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http://serverfault.com – I was able to set the auto scaling policy and also tested works fine, I am using EC2 small instance to run Ruby on Rails app, since Rails is more of Memory Intense platform I wanna scale the EC2 instances based upon the memory not on CPU Utilization. I googled yesterday but did not fetched any results which would actually helped me. Any suggestions would be help ful. (HowTos)