public Map<QuotaName, Float> getQuotaUsagePercentage() {
    return Collections.unmodifiableMap(this.quotaUsagePercentage);
  }
@return A {@link Map} of quota  name and estimation of percentage of quota in use when the recommendation was made.
ambry-api/src/main/java/com/github/ambry/quota/ThrottlingRecommendation.java