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There is not a push notification mechanism in Horizon, only pull. I'm not sure adding the message on a separate thread will work because it's being added to a request that is not longer the active request.
The only way to accomplish that now is the poll for results from the API. Much like the instances tables does, https://github.com/openstack/horizon/blob/master/openstack_dashboard/dashboards/project/instances/tables.py#L663
It's an area of improvement in Horizon we're trying to address.
