On 30.08.2012, at 11:52, C. L. Martinez wrote: > I am searching some lightweight tool to control when rsyslog didn't > receive events from a > specific host or group of hosts for x minutes/seconds. > > Only a simple tool to send an email when an alert is triggered, I > don't need flat tools like zabbix or similars. try SEC: <http://sourceforge.net/projects/simple-evcorr/> SEC can do a lot more, but your requirement can be implemented in a fairly simple rule. The tool is rock-solid and I've been using it in a number of projects for years.