Falcon+
An open-source and enterprise-level monitoring system
... point of failure, easy to operate and deploy. Falcon-agent has already 400+ built-in server metrics. Users can collect their customized metrics by writing plugins or just simply run a script/program to relay metrics to falcon-agent. For easier management of alerting rules, Open-Falcon supports strategy templating, inheritance, and multiple alerting method, and callback for recovery. Open-Falcon could present multi-dimension graph, including user-defined dashboard/screen.