Re: n_ins_since_vacuum stats for aborted transactions

> Except there isn’t some singular provably correct value here.  Today’s behavior (considering dead tuples)
> is not intrinsically wrong nor correct, and neither is what you propose (ignoring the dead tuples).
> The fact that those dead tuples get removed regardless is a point in favor of counting them when deciding what to do.
> And it’s also the long-standing behavior.  You need to make a compelling argument to change to your preference.
>
> Inserting aborted dead tuples moves the counter closer to both autovacuum thresholds.
> There is no reason why that should be prohibited.  I can see the argument for why one
> threshold should be dead tuples only and the other live tuples only - but I don’t favor that design.

Fair enough, and I think I got my answers from this thread. This
design decision was not
discussed in the thread for b07642dbcd8.

So, I think public documentation updates to clarify that
n_tup_upd|del|ins, and n_ins_since_vacuum include
aborted rows is a good enhancement.

Also a code comment in pgstat_relation_flush_cb that explains
ins_since_vacuum intentionally includes aborted inserts.

tabentry->ins_since_vacuum += lstats->counts.tuples_inserted;

--
Sami Imseih