private com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.workstations.v1beta.WorkstationConfig.Host.GceInstance
                    .GceConfidentialInstanceConfig,
                com.google.cloud.workstations.v1beta.WorkstationConfig.Host.GceInstance
                    .GceConfidentialInstanceConfig.Builder,
                com.google.cloud.workstations.v1beta.WorkstationConfig.Host.GceInstance
                    .GceConfidentialInstanceConfigOrBuilder>
            getConfidentialInstanceConfigFieldBuilder() {
          if (confidentialInstanceConfigBuilder_ == null) {
            confidentialInstanceConfigBuilder_ =
                new com.google.protobuf.SingleFieldBuilderV3<
                    com.google.cloud.workstations.v1beta.WorkstationConfig.Host.GceInstance
                        .GceConfidentialInstanceConfig,
                    com.google.cloud.workstations.v1beta.WorkstationConfig.Host.GceInstance
                        .GceConfidentialInstanceConfig.Builder,
                    com.google.cloud.workstations.v1beta.WorkstationConfig.Host.GceInstance
                        .GceConfidentialInstanceConfigOrBuilder>(
                    getConfidentialInstanceConfig(), getParentForChildren(), isClean());
            confidentialInstanceConfig_ = null;
          }
          return confidentialInstanceConfigBuilder_;
        }
<pre>
Optional. A set of Compute Engine Confidential VM instance options.
</pre>

<code>
.google.cloud.workstations.v1beta.WorkstationConfig.Host.GceInstance.GceConfidentialInstanceConfig confidential_instance_config = 10 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-workstations/proto-google-cloud-workstations-v1beta/src/main/java/com/google/cloud/workstations/v1beta/WorkstationConfig.java