merged in https://github.com/openshift/cluster-kube-apiserver-operator/pull/1115

$ oc get clusterversion
NAME      VERSION                             AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.8.0-0.nightly-2021-04-30-201824   True        False         88m     Cluster version is 4.8.0-0.nightly-2021-04-30-201824

$ oc get prometheusrules.monitoring.coreos.com/cpu-utilization -n openshift-kube-apiserver -oyaml
apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  creationTimestamp: "2021-05-06T02:03:48Z"
  generation: 1
  managedFields:
  - apiVersion: monitoring.coreos.com/v1
    fieldsType: FieldsV1
    fieldsV1:
      f:spec:
        .: {}
        f:groups: {}
    manager: cluster-kube-apiserver-operator
    operation: Update
    time: "2021-05-06T02:03:48Z"
  name: cpu-utilization
  namespace: openshift-kube-apiserver
  resourceVersion: "17201"
  uid: ce838b0c-07b0-47e7-a915-4ab4ef4ce2a4
spec:
  groups:
  - name: control-plane-cpu-utilization
    rules:
    - alert: HighOverallControlPlaneCPU
      expr: |
        sum(
          100 - (avg by (instance) (rate(node_cpu_seconds_total{mode="idle"}[5m])) * 100)
          AND on (instance) label_replace( kube_node_role{role="master"}, "instance", "$1", "node", "(.+)" )
        )
        /
        count(kube_node_role{role="master"})
        > 60
      for: 10m
      labels:
        severity: warning
    - alert: ExtremelyHighIndividualControlPlaneCPU
      expr: |
        100 - (avg by (instance) (rate(node_cpu_seconds_total{mode="idle"}[5m])) * 100) > 90 AND on (instance) label_replace( kube_node_role{role="master"}, "instance", "$1", "node", "(.+)" )
      for: 5m
      labels:
        severity: critical

The HighOverallControlPlaneCPU has already been applied, also can be seen in web-console.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: OpenShift Container Platform 4.8.2 bug fix and security update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:2438