Acknoledge logwatch warnings
from https://mathias-kettner.de/checkmk_logfiles.html:
Whenever check_mk detects new log messages, it stores them on the Nagios host in a directory that defaults to /var/lib/check_mk/logwatch. Each host gets a subdirectory, each logfile's messages are stored in one file. The Nagios service that reflects a logfile is in warning or critical state, if that file exists and contains at least one warning or critical message resp. The /check_mk/logwatch.py web page allows you to nicely browse the messages in that file and acknowledges them, if you consider the problem to be solved. Acknowledgement means deletion of the file. Shortly afterwards the service of the logfile enters OK state in Nagios. The default Nagios templates of Check_MK automatically create notes_url entries for all logwatch based services to that page.
(from redmine: created on 2014-02-19)