lib/utils/tracking.js/processResponseBody
const processResponseBody = (response, id, startTime) => {
  return response.buffer().then(
    () => {
      const endTime = Date.now();
      --ongoingRequestsCount;
      if (serverlessRunEndTime && !ongoingRequestsCount && process.env.SLS_STATS_DEBUG) {
        log(
          format(
            'Stats request prevented process from exiting for %dms (request time: %dms)',
            endTime - serverlessRunEndTime,
            endTime - startTime
          )
        );
      }
      return null; // For consistency do not expose any result
    },
    error => {
      --ongoingRequestsCount;
      logError(`Response processing error for ${id}`, error);
      return null;
    }
  );
};