Nginx 的監控程式

網路資源：

1. https://www.datadoghq.com/blog/how-to-collect-nginx-metrics/
2. https://www.datadoghq.com/blog/how-to-monitor-nginx/
3. https://blog.serverdensity.com/monitor-nginx/
4. https://easyengine.io/tutorials/nginx/status-page/
5. https://www.scalyr.com/community/guides/how-to-monitor-nginx-the-essential-guide
6. http://www.slideshare.net/serverdensity/how-to-monitor-nginx
7.