docs: public BatchMeterUsageRequest withUsageRecords(UsageRecord... usageRecords) {
          if (this.usageRecords == null) {
              setUsageRecords(new java.util.ArrayList<UsageRecord>(usageRecords.length));
          }
          for (UsageRecord ele : usageRecords) {
              this.usageRecords.add(ele);
          }
          return this;
      }