@java.lang.Override
  public com.google.cloud.vertexai.api.GenerationConfig.RoutingConfigOrBuilder
      getRoutingConfigOrBuilder() {
    return routingConfig_ == null
        ? com.google.cloud.vertexai.api.GenerationConfig.RoutingConfig.getDefaultInstance()
        : routingConfig_;
  }
<pre>
Optional. Routing configuration.
</pre>

<code>
optional .google.cloud.vertexai.v1.GenerationConfig.RoutingConfig routing_config = 17 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GenerationConfig.java