To execute on execution failure

        :param kser.result.Result result: Execution result
        :return: Execution result
        :rtype: kser.result.Result

def _onerror(self, result):
        """ To execute on execution failure

        :param kser.result.Result result: Execution result
        :return: Execution result
        :rtype: kser.result.Result
        """
        if KSER_METRICS_ENABLED == "yes":
            KSER_TASKS_STATUS.labels(
                __hostname__, self.__class__.path, 'FAILED'
            ).inc()

        if result:
            result = self.result + result
        else:
            result = self.result
        logger.error(
            "{}.Failed: {}[{}]: {}".format(
                self.__class__.__name__, self.__class__.path, self.uuid, result
            ),
            extra=dict(
                kmsg=Message(
                    self.uuid, entrypoint=self.__class__.path,
                    params=self.params, metadata=self.metadata
                ).dump(),
                kresult=ResultSchema().dump(result) if result else dict()
            )
        )
        return self.onerror(result)