nginx.conf

daemon         off;

worker_processes 2;

error_log /tmp/nginx_error.log warn;

events {
}

http {
    # Lua configuration
    lua_package_path    "$prefix/?.lua;;";
    lua_shared_dict     log_dict    1M;

    server {
        listen 8080;

        location / {
            # Replace with your web application
            content_by_lua "
                ngx.say('Hello');
            ";

            
            # this logging code can be added to any existing nginx.conf   
            log_by_lua '
                local logging = require("logging")

                local request_time = ngx.now() - ngx.req.start_time()
                logging.add_plot(ngx.shared.log_dict, "request_time", request_time)
           ';
        }
    }

    # log server - print the log generated by our web application
    server {
        
        listen 127.0.0.1:6080;

        location / {
            content_by_lua '
                local logging = require("logging")
                
                local count, avg, elapsed_time = 
                    logging.get_plot(ngx.shared.log_dict, "request_time")

                local qps = 0

                ngx.say("Since last measure:\t", elapsed_time, " secs")
                ngx.say("Request Count:\t\t", count)
                ngx.say("Average req time:\t", avg, " secs")
                if elapsed_time > 0 then
                    qps = count / elapsed_time
                end
                ngx.say("Requests per Secs:\t", qps)
            ';
        }
    }
}