Autoscaling in OpenShift 3.11 with prometheus?

1. I am trying to horizontally autoscale pods based upon application metrics in Openshift with Prometheus. However, my prometheus is not able  to  scrape the metrics from application . Any proper documentation or pointers in this regard?

Refrence: https://www.youtube.com/watch?v=h0OdaZ-j6YI&t=395s

2.  After replacing  Hawkular by Prometheus in OpenShift , do we still need metrics server to be configured in our openshift cluster or Prometheus can  take care of the resource metrics(CPU and   memory) as well? and if yes? will it work on openshift 3.11?


FYI: I am trying the above in OKD


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