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Re:NGINX open sources TCP load balancing by gmjosack on Monday April 20, 2015 @07:28PM (#9411442)
I've been able to get real-time stats in nginx by adding custom counters with the lua plugin and exporting a stats handler.

http://wiki.nginx.org/HttpLuaModule#ngx.shared.DICT

Re:NGINX open sources TCP load balancing by phildougherty on Monday April 20, 2015 @11:28PM (#9412138)
You can also use collectd nginx module along with nginx stub-status module to gather some useful metrics.