code: public com.google.protobuf.Timestamp getInsertTime() {
      return insertTime_ == null ? com.google.protobuf.Timestamp.getDefaultInstance() : insertTime_;
    }
docs: <pre>
  Time that this operation was created.
  &#64;OutputOnly
  </pre>
  
  <code>.google.protobuf.Timestamp insert_time = 2;</code>