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Cloned from launchpad blueprint https://blueprints.launchpad.net/heat/+spec/ceilometer-combination-alarms. Description: Ceilometer has different types of alarms, the one of OS::Ceilometer::Alarm being implicitely "threshold". There is another type called "combination" which takes a list of alarms ids, and an operator dictating when its own state changes (and/or). We should create a new resource called OS::Ceilometer::CombinationAlarm to support this API. We also may want to alias Alarm to ThresholdAlarm for clarity, but it should be done separately. Specification URL (additional information): None