@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
    }
    if (((bitField0_ & 0x00000001) != 0)) {
      output.writeMessage(2, getSubmission());
    }
    if (((bitField0_ & 0x00000002) != 0)) {
      output.writeMessage(3, getThreatInfo());
    }
    if (((bitField0_ & 0x00000004) != 0)) {
      output.writeMessage(4, getThreatDiscovery());
    }
    getUnknownFields().writeTo(output);
  }
<pre>
Provides additional information about how the submission was discovered.
</pre>

<code>.google.cloud.webrisk.v1.ThreatDiscovery threat_discovery = 4;</code>
java-webrisk/proto-google-cloud-webrisk-v1/src/main/java/com/google/webrisk/v1/SubmitUriRequest.java