Falcon+
An open-source and enterprise-level monitoring system
...Scalable monitoring system is necessary to support rapid business growth. Each module of Open-Falcon is super easy to scale horizontally. With RRA(Round Robin Archive) mechanism, the one-year history data of 100+ metrics could be returned in just one second. No critical single 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. ...