public com.google.cloud.vmmigration.v1.UpgradeStatus getUpgradeStatus() {
      if (upgradeStatusBuilder_ == null) {
        return upgradeStatus_ == null
            ? com.google.cloud.vmmigration.v1.UpgradeStatus.getDefaultInstance()
            : upgradeStatus_;
      } else {
        return upgradeStatusBuilder_.getMessage();
      }
    }
<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>

@return The upgradeStatus.
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/DatacenterConnector.java