private QuotaAction mergeQuotaAction(QuotaAction quotaAction1, QuotaAction quotaAction2) {
    if (quotaAction1.compareTo(quotaAction2) > 0) {
      return quotaAction1;
    }
    return quotaAction2;
  }
Merge the {@link QuotaAction} objects into one by picking the more severe of the specified {@link QuotaAction}
objects. For more details about severity check {@link QuotaAction}.
@param quotaAction1 {@link QuotaAction} object.
@param quotaAction2 {@link QuotaAction} object.
@return QuotaAction which is the more severe {@link QuotaAction} in the pair.
ambry-quota/src/main/java/com/github/ambry/quota/SimpleQuotaRecommendationMergePolicy.java