[check_postgres] negative result from hot_standby_delay action

[Filip Rembiałkowski]

Hello.

hot_standby_delay sometimes returns negative value.

I know the reason behind this - quite naturally the delay between querying
master ad slave can cause this.

I think it makes sense to fix it in check_postgres.pl by something like
$result = 0 if $result < 0;
All in all, it is logically impossible that slave has processed more WAL
segments than master :-)



thanks,
Filip
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