Questions About TODO: Issuing NOTICEs for row count differences in EXPLAIN ANALYZE

Hello Hackers,
I am currently looking into the following TODO item, "Have EXPLAIN ANALYZE
issue NOTICE messages when the estimated and actual row counts differ by a
specified percentage."
What's the current status of this TODO, and is there any prior discussion
or rationale behind it ?
Specifically:
- How can we come up with a percentage for row count differences (fixed
value or dynamic)?
- Should we consider a configurable param for users ?
- Is there anything extra to consider ?

Thank you.