[CentOS] Squid and log files

Hi,

I have Squid running on several CentOS proxy servers. Here's what the
Squid log file directory looks like on my own server:

access.log
access.log-20180311.gz
access.log-20180319.gz
access.log-20180429.gz
access.log-20180506.gz
access.log-20180514.gz
cache.log
cache.log-20180416.gz
cache.log-20180422.gz
cache.log-20180430.gz
cache.log-20180506.gz
cache.log-20180514.gz
squidGuard.log

I don't know if the compressed and archived *.gz log files are supposed
to be erased some time. Anyway, I'd like to make sure they are kept at
least for one full year.

Where is this defined ?

Niki
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