Hi UFHH01,
ok, I understand what you mean... So, my question is about, if these lines of log are a foreknowledge of a problem, or these logs are common in Plesk.
Because I've two old servers with Plesk 10.4.4 and 11.0.9 (qmail is installed) and I can find these log for both. Now I'm on 17.5.3...