We can update kubelet config with KubeletConfig CR, this can also be done through PerformanceProfile
apiVersion: performance.openshift.io/v2
kind: PerformanceProfile
metadata:
annotations:
kubeletconfig.experimental: |
{"maxPods": 500,"systemReserved":{"memory":"2.5Gi"},"kubeReserved":{"memory":"2Gi"}}
...
Refer to kubelet-config to get more info.