public Builder mergeMetadata(com.google.cloud.visionai.v1.RequestMetadata value) {
        if (metadataBuilder_ == null) {
          if (((bitField0_ & 0x00000004) != 0)
              && metadata_ != null
              && metadata_ != com.google.cloud.visionai.v1.RequestMetadata.getDefaultInstance()) {
            getMetadataBuilder().mergeFrom(value);
          } else {
            metadata_ = value;
          }
        } else {
          metadataBuilder_.mergeFrom(value);
        }
        if (metadata_ != null) {
          bitField0_ |= 0x00000004;
          onChanged();
        }
        return this;
      }
<pre>
The configurations that specify where packets are retrieved.
</pre>

<code>.google.cloud.visionai.v1.RequestMetadata metadata = 1;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/ReceivePacketsRequest.java