'Get UUIDs of performance instances for a cluster node.'

def get_performance_instance_uuids(self, object_name, node_name):

    api_args = {'objectname': object_name, 'query': {'instance-info': {'uuid': (node_name + ':*')}}}
    result = self.send_request('perf-object-instance-list-info-iter', api_args, enable_tunneling=False)
    uuids = []
    instances = (result.get_child_by_name('attributes-list') or netapp_api.NaElement('None'))
    for instance_info in instances.get_children():
        uuids.append(instance_info.get_child_content('uuid'))
    return uuids
