Experience of using load testing tool - http://www.netatlantis.com/?p=3320 , in his opinions, look like http://www.loadui.org/ is the best 

http://www.softwaretestingmagazine.com/knowledge/preparing-for-load-testing-best-practices/

Use of Prometheus - https://levelup.gitconnected.com/the-idea-of-synthetic-monitoring-6c1e9d1caa07