@java.lang.Override
    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
      if (routingConfigCase_ == 1) {
        output.writeMessage(
            1,
            (com.google.cloud.vertexai.api.GenerationConfig.RoutingConfig.AutoRoutingMode)
                routingConfig_);
      }
      if (routingConfigCase_ == 2) {
        output.writeMessage(
            2,
            (com.google.cloud.vertexai.api.GenerationConfig.RoutingConfig.ManualRoutingMode)
                routingConfig_);
      }
      getUnknownFields().writeTo(output);
    }
<pre>
Manual routing.
</pre>

<code>
.google.cloud.vertexai.v1.GenerationConfig.RoutingConfig.ManualRoutingMode manual_mode = 2;
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GenerationConfig.java