public MetricDefinition clearDimensionKeysEntries() {
        this.dimensionKeys = null;
        return this;
    }
Removes all the entries added into DimensionKeys.

@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-cloudwatchrum/src/main/java/com/amazonaws/services/cloudwatchrum/model/MetricDefinition.java