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

    size = 0;
    for (int i = 0; i < partialFailures_.size(); i++) {
      size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, partialFailures_.get(i));
    }
    if (((bitField0_ & 0x00000001) != 0)) {
      size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getCreateTime());
    }
    if (((bitField0_ & 0x00000002) != 0)) {
      size += com.google.protobuf.CodedOutputStream.computeMessageSize(3, getUpdateTime());
    }
    size += getUnknownFields().getSerializedSize();
    memoizedSize = size;
    return size;
  }
<pre>
Output only. Time when the operation was updated for the last time.
If the operation has finished (successfully or not), this is the finish
time.
</pre>

<code>.google.protobuf.Timestamp update_time = 3 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GenericOperationMetadata.java