private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vmmigration.v1.UpgradeStatus,
            com.google.cloud.vmmigration.v1.UpgradeStatus.Builder,
            com.google.cloud.vmmigration.v1.UpgradeStatusOrBuilder>
        getUpgradeStatusFieldBuilder() {
      if (upgradeStatusBuilder_ == null) {
        upgradeStatusBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vmmigration.v1.UpgradeStatus,
                com.google.cloud.vmmigration.v1.UpgradeStatus.Builder,
                com.google.cloud.vmmigration.v1.UpgradeStatusOrBuilder>(
                getUpgradeStatus(), getParentForChildren(), isClean());
        upgradeStatus_ = null;
      }
      return upgradeStatusBuilder_;
    }
<pre>
Output only. The status of the current / last upgradeAppliance operation.
</pre>

<code>
.google.cloud.vmmigration.v1.UpgradeStatus upgrade_status = 16 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/DatacenterConnector.java