Screen squid is web-based interface for viewing reports based on Squid proxy server log files. It can be accessed from web-browser through more than 50 reports. No extra files, only DB. All reports generated "on-the-fly". And we got personal cabinet for each user/group.
...If the Server is not responding in the given time (loss) an entry is made to a failure-protokol-file. Overview and list of offlinetimes. Edit-function. Graphical view. PDF-Output. Supports Language-Files.