How to gather compliance and file integrity metrics operators in OpenShift Container Platform 4?

Issue

To gather compliance and file integrity operator metrics it is needed to have respective namespaces with “openshift.io/cluster-monitoring=true” label so it is possible to gather metrics in older versions, as this is configured already form OpenShift Container Platform 4.9 and onwards automatically, otherwise, the following errors are seen:

{"level":"error","ts":3200.30202,"logger":"cmd","msg":"Error getting metrics service","error":"services \"metrics\" not found","stacktrace":"main.RunOperator\n\t/go/src/github.com/openshift/compliance-operator/cmd/manager/operator.go

User \"system:serviceaccount:openshift-monitoring:prometheus-k8s\" cannot list resource \"endpoints\" in API group \"\" in the namespace \"openshift-file-integrity\": RBAC: role.rbac.authorization.k8s.io \"prometheus-k8s\" not found"
User \"system:serviceaccount:openshift-monitoring:prometheus-k8s\" cannot list resource \"endpoints\" in API group \"\" in the namespace \"openshift-compliance\": RBAC: role.rbac.authorization.k8s.io \"prometheus-k8s\" not found"