[squid-users] when/who login in to proxy?

[Alan Boba]

I've been able to set up digest file authentication on the Squid proxy by adding the following to squid3.conf.
auth_param digest program /usr/lib/squid3/digest_file_auth -c /etc/squid3/passwordsauth_param digest realm proxyacl authenticated proxy_auth REQUIREDhttp_access allow authenticated

I have a user called testuser. When attempting to browse a login challenge is displayed. The account login works, web browsing works. 
How to track account used and when logins occur? My online searches have been fruitless.
I tried discovering what log file it may be in by examining all logs on the server# grep testuser /var/log/*

That produced only two hits, both in /var/log/auth.log
The first hit was from the htdigest command used to create testuser and the second was from the sudo grep testuser command used to search the log files

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