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Scaling based on memory utilisation is not all that different - in the autostart.yaml example you linked, you'd use the 'memory' trigger rather than the 'cpu-util' trigger.

The difference is that Ceilometer doesn't really collect memory usage data by default - you'll need to enable instance usage auditing in your Nova config.

See the 'Configure Nova' section of the Ceilometer install guide:

http://docs.openstack.org/developer/ceilometer/install/manual.html