Monit

Monit is a free, open-source process supervision tool for Unix and Linux. Monit can restart a process automatically if process dies or monitor process characteristics, such as memory or cpu cycles and alert or execute and action. Monit only support alert messages by emailt.

• Config file: /etc/monit/monitrc (monit -t) to verify configuration file

set daemon 120 By default configured to check services every 120 seconds.

• Logs: /var/log/monit.log
• Command: monit status
• Restart Monit service: systemctl restart monit.service

See also

• Monitoring: Prometheus, Cacti, monit, munin, RRDtool, Zabbix, Netdata, Nagios, Check MK, Icinga, Pingdom, OpsGenie and Datadog, Opsgenie, PRTG, Checkmk

https://mmonit.com/monit/documentation/monit.html#ALERT-MESSAGES