added doc

Author: lksfrnz

src/main/java/software/amazon/cloudwatchlogs/emf/model/MetricsContext.java

@@ -126,6 +126,7 @@ public boolean hasDefaultDimensions() {
      * @param value Value of the metric
      * @param unit The unit of the metric
      * @param storageResolution The resolution of the metric
+     * @param aggregationType The aggregation type of the metric
      * @throws InvalidMetricException if the metric is invalid
      */
     public void putMetric(