Get the SLA information for a customer request for a given request ID or key and SLA metric ID
        IMPORTANT: The calling user must be an agent

        :param issue_id_or_key: str
        :param sla_id: str
        :return: SLA information

def get_sla_by_id(self, issue_id_or_key, sla_id):
        """
        Get the SLA information for a customer request for a given request ID or key and SLA metric ID
        IMPORTANT: The calling user must be an agent

        :param issue_id_or_key: str
        :param sla_id: str
        :return: SLA information
        """
        url = 'rest/servicedeskapi/request/{0}/sla/{1}'.format(issue_id_or_key, sla_id)

        return self.get(url)