public Builder setMetadata(com.google.cloud.talent.v4.ResponseMetadata value) {
      if (metadataBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        metadata_ = value;
      } else {
        metadataBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000004;
      onChanged();
      return this;
    }
<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