check_logfiles 3.5.1 Description:
check_logfiles is a plugin for Nagios which checks logfiles for defined patterns. check_logfiles project is capable of detecting logfile rotation. If you tell it how the rotated archives look, it will also examine these files. Unlike check_logfiles, traditional logfile plugins were not aware of the gap which could occur, so under some circumstances they ignored what had happened between their checks. A configuration file is used to specify where to search, what to search, and what to do if a matching line is found.