code: public GetInstanceMetricDataRequest withStatistics(String... statistics) {
          if (this.statistics == null) {
              setStatistics(new java.util.ArrayList<String>(statistics.length));
          }
          for (String ele : statistics) {
              this.statistics.add(ele);
          }
          return this;
      }
docs: <p>
  The instance statistics.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setStatistics(java.util.Collection)} or {@link #withStatistics(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param statistics
  The instance statistics.
  @return Returns a reference to this object so that method calls can be chained together.
  @see MetricStatistic