code: public com.google.protobuf.Duration getAggregationWindowLength() {
      return aggregationWindowLength_ == null ? com.google.protobuf.Duration.getDefaultInstance() : aggregationWindowLength_;
    }
docs: <pre>
  Period of time over which CPU utilization is calculated.
  </pre>
  
  <code>.google.protobuf.Duration aggregation_window_length = 1;</code>