What are some alternatives?
Cyberark - Security for the Heart of the Enterprise
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Vulcan - DigitalOcean's API-compatible alternative to Prometheus
Icinga - Icinga is a fork of Nagios and is backward compatible.
netdata - Real-time performance monitoring, done right