private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.video.stitcher.v1.RequestMetadata,
            com.google.cloud.video.stitcher.v1.RequestMetadata.Builder,
            com.google.cloud.video.stitcher.v1.RequestMetadataOrBuilder>
        getRequestMetadataFieldBuilder() {
      if (requestMetadataBuilder_ == null) {
        requestMetadataBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.video.stitcher.v1.RequestMetadata,
                com.google.cloud.video.stitcher.v1.RequestMetadata.Builder,
                com.google.cloud.video.stitcher.v1.RequestMetadataOrBuilder>(
                getRequestMetadata(), getParentForChildren(), isClean());
        requestMetadata_ = null;
      }
      return requestMetadataBuilder_;
    }
<pre>
The request metadata used to make the ad request.
</pre>

<code>.google.cloud.video.stitcher.v1.RequestMetadata request_metadata = 2;</code>
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/AdRequest.java