Which host availability monitoring system to choose?

Question

Computer networks

There was a task of monitoring the activity of several dozen network devices - computers, servers, switches. Wishlist: web interface with a visual picture of devices and a network map; configurability of the unavailability interval - i.e., for example, monitoring should sound an alarm if the device is unavailable for 5 minutes, and not every second, if suddenly somewhere the ping is delayed; accordingly, information about a device that has stopped responding should be promptly sent by mail or SMS.

Answer 1

zabbix

Answer 2

https://rmonitoring.ru
Excellent host availability service with flexible configuration and e-mail notification