The "Master metrics" runs the "Worker metrics". The "Master metrics" should be running always.
When you want to start collecting HAProxy service metrics the "Master metrics" will start local worker for every HAProxy service. The "Worker metrics" will check every HAProxy service remotely by 1999 port(by default). If you want to use the metrics service and if you have install HAProxy service manually read how you should set HAProxy service.
How to start using RPM you can read in this article
|Login (without "@"):|
|RPM or/and Docker?|