@java.lang.Override
  public com.google.protobuf.FieldMaskOrBuilder getUpdateMaskOrBuilder() {
    return updateMask_ == null ? com.google.protobuf.FieldMask.getDefaultInstance() : updateMask_;
  }
<pre>
Required. Mask specifying which fields in the workstation configuration
should be updated.
</pre>

<code>.google.protobuf.FieldMask update_mask = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-workstations/proto-google-cloud-workstations-v1beta/src/main/java/com/google/cloud/workstations/v1beta/UpdateWorkstationRequest.java