Zabbix

Zabbix is a full monitoring platform that collects metrics from agents, SNMP devices, and JMX endpoints, stores them in its own database, and turns thresholds into alerts with acknowledgement and escalation workflows. It ships templates for common infrastructure, supports proxy and active checks, and includes a web front end for dashboards, network maps, and capacity reports.

Operations teams use it to watch server fleets, network gear, and applications in one place with clear ownership per trigger.

Running it on your own hardware keeps the inventory and metric history inside your network, avoids licences that scale with the monitored host count, and puts database backups under your control.