private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.workstations.v1.WorkstationConfig.Host,
            com.google.cloud.workstations.v1.WorkstationConfig.Host.Builder,
            com.google.cloud.workstations.v1.WorkstationConfig.HostOrBuilder>
        getHostFieldBuilder() {
      if (hostBuilder_ == null) {
        hostBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.workstations.v1.WorkstationConfig.Host,
                com.google.cloud.workstations.v1.WorkstationConfig.Host.Builder,
                com.google.cloud.workstations.v1.WorkstationConfig.HostOrBuilder>(
                getHost(), getParentForChildren(), isClean());
        host_ = null;
      }
      return hostBuilder_;
    }
<pre>
Optional. Runtime host for the workstation.
</pre>

<code>
.google.cloud.workstations.v1.WorkstationConfig.Host host = 12 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-workstations/proto-google-cloud-workstations-v1/src/main/java/com/google/cloud/workstations/v1/WorkstationConfig.java