'Force a sync of all instances, potentially by project_id,
and potentially since a certain date/time.'

def sync_instances(self, ctxt, project_id, updated_since, deleted):

    method_kwargs = dict(project_id=project_id, updated_since=updated_since, deleted=deleted)
    message = _BroadcastMessage(self, ctxt, 'sync_instances', method_kwargs, 'down', run_locally=False)
    message.process()
