Support for ceilometer combination alarms

Registered by Thomas Herve

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.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Medium
Drafter:
Thomas Herve
Direction:
Needs approval
Assignee:
Thomas Herve
Definition:
Review
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
Thomas Herve
Completed by
Thomas Herve

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Gerrit topic: https://review.openstack.org/#q,topic:bp/ceilometer-combination-alarms,n,z

Addressed by: https://review.openstack.org/62672
    Add new Ceilometer combination alarm resource

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