@atomic.action_timer("nova.unlock_server")
    def _unlock_server(self, server):
        server.unlock()
Register a new callback function to be invoked
dataset/ETHPy150Open openstack/rally/rally/plugins/openstack/scenarios/nova/utils.py/NovaScenario._unlock_server--crossover with--dataset/ETHPy150Open glue-viz/glue/glue/viewers/custom/qt/custom_viewer.py/FormElement.add_callback