index bloat estimation

Dear Colleagues,

What queries do you use to estimate index and table bloat?

I've researched some on the Net and found multiple scripts mentioned in
https://wiki.postgresql.org/wiki/Index_Maintenance#Index_Bloat, also
in https://github.com/pgexperts/pgx_scripts etc. 

Most of the stuff I've looked at is pretty old, much seems unsupported.
What is the current best practice?

I'd be grateful if you could share your personal favourite ways of
estimating bloat.

-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
2:5005/49@fidonet http://vas.tomsk.ru/