Counter for logging active connections

[mbordash]

Hi,

In my SMTPserver service I setup the following logic:

onConnect ( session, callback ) {
       connCount++;
       logger.info( 'Number of concurrent connections: ' + connCount );
       return callback();
   },
   onClose( session ) {
       if( connCount >= 1 ) {
           connCount--;
       } else {
           connCount = 0;
       }
   },

This was working great and we were able to track connections over time in grafana, however, one of our customers now proxies requests through a load balancer. Our counters increase due to onConnect but onClose doesn't get called any more. I suspect it is because the loadbalancer now keeps connections open, or perhaps sends "ping/alive" requests which skews the numbers.

Can you advise on a better way to track client connections other than the way I'm doing it above?

Thank you,

Michael