Access your server through the web browser at port 9100 and browse the metrics (http://your_server_ip:9090/metrics). You should get an output in the browser similar to:

curl http://localhost:9090/metrics

Access your server through the web browser at port 9100 and browse the metrics (http://your_server_ip:9100/metrics). You should get an output in the browser similar to:

curl http://localhost:9100/metrics