What are some alternatives?
Cyberark - Security for the Heart of the Enterprise
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
Vulcan - DigitalOcean's API-compatible alternative to Prometheus
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.
netdata - Real-time performance monitoring, done right