@java.lang.Override
  public com.google.cloud.vmmigration.v1.AvailableUpdatesOrBuilder getAvailableVersionsOrBuilder() {
    return availableVersions_ == null
        ? com.google.cloud.vmmigration.v1.AvailableUpdates.getDefaultInstance()
        : availableVersions_;
  }
<pre>
Output only. The available versions for updating this appliance.
</pre>

<code>
.google.cloud.vmmigration.v1.AvailableUpdates available_versions = 15 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/DatacenterConnector.java