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Is it true, that resource plugins are kind of "passive", i.e. they do not "run" constantly (for example in a dedicated thread, or part of event-loop), but are instead passively waiting to be invoked in order to do their time-constrained task?

If that's the case, it sounds that resource plugins wouldn't be as such suitable for continuous monitoring of nova-/ceilometer-/whatever notifications?

Would it be feasible to provide some sort of "listener plug-in" -support for heat-engine? Any preliminary ideas how to build one?