ReportQuestion.
        [Preview API] Flags a concern with an existing question for an extension.
        :param :class:`<Concern> <azure.devops.v5_1.gallery.models.Concern>` concern: User reported concern with a question for the extension.
        :param str pub_name: Name of the publisher who published the extension.
        :param str ext_name: Name of the extension.
        :param long question_id: Identifier of the question to be updated for the extension.
        :rtype: :class:`<Concern> <azure.devops.v5_1.gallery.models.Concern>`

def report_question(self, concern, pub_name, ext_name, question_id):
        """ReportQuestion.
        [Preview API] Flags a concern with an existing question for an extension.
        :param :class:`<Concern> <azure.devops.v5_1.gallery.models.Concern>` concern: User reported concern with a question for the extension.
        :param str pub_name: Name of the publisher who published the extension.
        :param str ext_name: Name of the extension.
        :param long question_id: Identifier of the question to be updated for the extension.
        :rtype: :class:`<Concern> <azure.devops.v5_1.gallery.models.Concern>`
        """
        route_values = {}
        if pub_name is not None:
            route_values['pubName'] = self._serialize.url('pub_name', pub_name, 'str')
        if ext_name is not None:
            route_values['extName'] = self._serialize.url('ext_name', ext_name, 'str')
        if question_id is not None:
            route_values['questionId'] = self._serialize.url('question_id', question_id, 'long')
        content = self._serialize.body(concern, 'Concern')
        response = self._send(http_method='POST',
                              location_id='784910cd-254a-494d-898b-0728549b2f10',
                              version='5.1-preview.1',
                              route_values=route_values,
                              content=content)
        return self._deserialize('Concern', response)