Description of problem:
there is KubeControllerManagerDown alert rule in kube-controller-manager-operator prometheusrules of openshift-kube-controller-manager-operator project,
and KubeSchedulerDown alert rule in kube-scheduler-operator prometheusrules of openshift-kube-scheduler-operator project.

Both KubeControllerManagerDown/KubeSchedulerDown alert rules also exist in kubernetes-monitoring-rules prometheusrules of openshift-monitoring project.
the only difference is the annotations part

# oc -n openshift-kube-controller-manager-operator get prometheusrules kube-controller-manager-operator -oyaml
...
spec:
  groups:
  - name: cluster-version
    rules:
    - alert: KubeControllerManagerDown
      annotations:
        message: KubeControllerManager has disappeared from Prometheus target discovery.
      expr: |
        absent(up{job="kube-controller-manager"} == 1)
      for: 15m
      labels:
        severity: critical
...

# oc -n openshift-monitoring get prometheusrules kubernetes-monitoring-rules -oyaml
...
  - name: kubernetes-system-controller-manager
    rules:
    - alert: KubeControllerManagerDown
      annotations:
        description: KubeControllerManager has disappeared from Prometheus target discovery.
        summary: Target disappeared from Prometheus target discovery.
      expr: |
        absent(up{job="kube-controller-manager"} == 1)
      for: 15m
      labels:
        severity: critical
*********************************************************

# oc -n openshift-kube-scheduler-operator get prometheusrules kube-scheduler-operator -oyaml
...
spec:
  groups:
  - name: cluster-version
    rules:
    - alert: KubeSchedulerDown
      annotations:
        message: KubeScheduler has disappeared from Prometheus target discovery.
      expr: |
        absent(up{job="scheduler"} == 1)
      for: 15m
      labels:
        severity: critical
...

# oc -n openshift-monitoring get prometheusrules kubernetes-monitoring-rules -oyaml
...
  - name: kubernetes-system-scheduler
    rules:
    - alert: KubeSchedulerDown
      annotations:
        description: KubeScheduler has disappeared from Prometheus target discovery.
        summary: Target disappeared from Prometheus target discovery.
      expr: |
        absent(up{job="scheduler"} == 1)
      for: 15m
      labels:
        severity: critical
...
Version-Release number of selected component (if applicable):
4.8.0-0.nightly-2021-03-30-160509

How reproducible:
always

Steps to Reproduce:
1. see the description
2.
3.

Actual results:
Duplicate KubeControllerManagerDown/KubeSchedulerDown alerts

Expected results:
Should not have duplicate alerts

Additional info: