Once upon a time, I used xlogmaster to keep an eye on my system logs, and all was well.
Then, what with not being maintained, xlogmaster disappeared from Debian, and I resorted to gnome-system-log, which was not as handy, but worked, for the most part.
Lately, however, gnome-system-log won't run for more'n a few minutes without going into 100%-CPU-usage mode.
And so I fall back on KSystemLog, which is even less handy in use, but, so far, seems to to be getting wedged.
Yes, I tried building xlogmaster from source. I'm reminded of why that didn't work last time, a couple of years ago: it requires GTK+ 1.2, and the configure script doesn't find GTK+ 2.0. I don't know whether it'd build nor run with the newer library, and am not sufficiently motivated to dig into the autoconf stuff.
Perhaps, one of these days, I'll write my own dang log-watcher. Maybe easily configurable, and set up to cope with the common forms of log rotation.