public Builder clearMetadata() {
      bitField0_ = (bitField0_ & ~0x00000004);
      metadata_ = null;
      if (metadataBuilder_ != null) {
        metadataBuilder_.dispose();
        metadataBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Input only. This field is for users to attach user managed metadata.
</pre>

<code>.google.protobuf.Struct metadata = 3 [(.google.api.field_behavior) = INPUT_ONLY];
</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/PacketHeader.java