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This page is very useful: http://openstack.redhat.com/CeilometerQuickStart

An example of creating a threshold-oriented alarm, based on a upper bound on the CPU utilization for a particular instance: ceilometer alarm-threshold-create --name cpu_high --description 'instance running hot' \ --meter-name cpu_util --threshold 70.0 --comparison-operator gt --statistic avg \ --period 600 --evaluation-periods 3 \ --alarm-action 'log://' \ --query resource_id=INSTANCE_ID