@java.lang.Override
  public int getSerializedSize() {
    int size = memoizedSize;
    if (size != -1) return size;

    size = 0;
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(endpoint_)) {
      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, endpoint_);
    }
    if (((bitField0_ & 0x00000001) != 0)) {
      size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getDeployedModel());
    }
    if (((bitField0_ & 0x00000002) != 0)) {
      size += com.google.protobuf.CodedOutputStream.computeMessageSize(4, getUpdateMask());
    }
    size += getUnknownFields().getSerializedSize();
    memoizedSize = size;
    return size;
  }
<pre>
Required. The update mask applies to the resource. See
[google.protobuf.FieldMask][google.protobuf.FieldMask].
</pre>

<code>.google.protobuf.FieldMask update_mask = 4 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/MutateDeployedModelRequest.java