Determine the current usage for each limit of this service,
        and update corresponding Limit via
        :py:meth:`~.AwsLimit._add_current_usage`.

def find_usage(self):
        """
        Determine the current usage for each limit of this service,
        and update corresponding Limit via
        :py:meth:`~.AwsLimit._add_current_usage`.
        """
        logger.debug("Checking usage for service %s", self.service_name)
        for lim in self.limits.values():
            lim._reset_usage()
        try:
            self.connect()
            resp = self.conn.get_send_quota()
        except EndpointConnectionError as ex:
            logger.warning('Skipping SES: %s', str(ex))
            return
        except ClientError as ex:
            if ex.response['Error']['Code'] in ['AccessDenied', '503']:
                logger.warning('Skipping SES: %s', ex)
                return
            raise
        self.limits['Daily sending quota']._add_current_usage(
            resp['SentLast24Hours']
        )
        self._have_usage = True
        logger.debug("Done checking usage.")