code: public DescribeMetricCollectionTypesResult withMetrics(MetricCollectionType... metrics) {
          if (this.metrics == null) {
              setMetrics(new com.amazonaws.internal.SdkInternalList<MetricCollectionType>(metrics.length));
          }
          for (MetricCollectionType ele : metrics) {
              this.metrics.add(ele);
          }
          return this;
      }
docs: <p>
  One or more metrics.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setMetrics(java.util.Collection)} or {@link #withMetrics(java.util.Collection)} if you want to override
  the existing values.
  </p>
  
  @param metrics
  One or more metrics.
  @return Returns a reference to this object so that method calls can be chained together.