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Thanks for your replies so far!

For a short time solution I could try to integrate the whole functionality inside heat-engine as proposed. But this future solution sounds better as later we would also like to consume ceilometer meters concerning stack instances.

Our current use case is to get immediate info (nova notification) about instance stopped (e.g. killed with kill -9) and restart it if certain MetricName/Namespace defined in Alarm for that instance (having restarter policy also).

Is there already some ready code + examples templates about "webhook" way to get notifications to heat? Does that solution use ceilometer current (grizzly) api or does that need changes to ceilometer also?

This area heat-ceilometer and getting "fault management" and "performance management" related online information could be the area where to contribute if getting familiar enough to these plans.