Nagios ^v1

Nagios is an open source program designed to monitor computer systems and networks: monitoring the state of computing nodes and services, notifying the administrator in case when some of the services stop (or resume) their work.

By integrating Nagios with the Notify.Events service, you will be able to receive prompt notifications about problems in your infrastructure, which will allow you to respond to the problem in a timely manner and eliminate it as soon as possible.