From Tech Republic, worth reading if you’re new to Linux system administration.
One of the most common mistakes is not checking log files (reason #10). I often find it hard to keep up and sometimes parse the variety of system logs on a system. A great tool for managing this is called LogWatch. While not a GUI, it summarizes system logs into a convenient report that you can cron to run regularly and email to yourself, or just monitor. It’s highly configurable with varying degrees of detail.
From the site:
Logwatch is a customizable log analysis system. Logwatch parses through your system’s logs for a given period of time and creates a report analyzing areas that you specify, in as much detail as you require.