public function RollbackNodePoolUpgrade(\Google\Cloud\Container\V1\RollbackNodePoolUpgradeRequest $argument,
      $metadata = [], $options = []) {
        return $this->_simpleRequest('/google.container.v1.ClusterManager/RollbackNodePoolUpgrade',
        $argument,
        ['\Google\Cloud\Container\V1\Operation', 'decode'],
        $metadata, $options);
    }