private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.talent.v4.ResponseMetadata,
            com.google.cloud.talent.v4.ResponseMetadata.Builder,
            com.google.cloud.talent.v4.ResponseMetadataOrBuilder>
        getMetadataFieldBuilder() {
      if (metadataBuilder_ == null) {
        metadataBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.talent.v4.ResponseMetadata,
                com.google.cloud.talent.v4.ResponseMetadata.Builder,
                com.google.cloud.talent.v4.ResponseMetadataOrBuilder>(
                getMetadata(), getParentForChildren(), isClean());
        metadata_ = null;
      }
      return metadataBuilder_;
    }
<pre>
Additional information for the API invocation, such as the request
tracking id.
</pre>

<code>.google.cloud.talent.v4.ResponseMetadata metadata = 3;</code>
java-talent/proto-google-cloud-talent-v4/src/main/java/com/google/cloud/talent/v4/ListCompaniesResponse.java