@java.lang.Override
    public boolean getCritical() {
      return critical_;
    }
<pre>
Determine whether it's critical to upgrade the appliance to this version.
</pre>

<code>bool critical = 3;</code>

@return The critical.
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/ApplianceVersion.java