Query regarding pg_prewarm extension

Hi PostgreSQL Community,

I have a question regarding the use of the pg_prewarm() function [1]
in the pg_prewarm extension. The function requires a relation name
and a range of pages (e.g., pages 10 to 50) to be warmed by shifting
them from disk to the buffer cache.

How can I decide which range of pages to prewarm?
I assume that it is related to hot pages in the relation,
but how can I identify which pages are likely to be hot
before they are even in the buffer cache?
Additionally, since tuples within a page can move to
different pages over time (due to operations like VACUUM FULL or REINDEX),
how should I handle this when selecting the pages to prewarm?

Any insights would be greatly appreciated.

Regards,
Ayush Vatsa

[1] https://www.postgresql.org/docs/current/pgprewarm.html#PGPREWARM-FUNCS