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I'm interested how to notify other applications of events in openstack. For example I want't to know in my application when an instance in nova was suspended or resumed. Are there any webhooks or something like that where could I get that info?
I was looking at official documentation on notification but I can't really make anything out of that: http://docs.openstack.org/trunk/openstack-network/admin/content/ch_adv_notification_overview.html
I could not find any examples with code on the web too.
Has anyone been doing anything like this yet?
Take a look at the OpenStack Ceilometer project. It captures different kinds of OpenStack events and log them into a database. The primary use case is for metering, but you may find it useful for your situation.