Description of the problem:
I found this issue on two env, OCP 4.9 cpu usage would not be displayed on the Grafana UI

Release version:

Operator snapshot version: 
2.3.4 RC1

OCP version:
OCP 4.9

Browser Info:

Steps to reproduce:
1. Deploy MCO CR
2. ObservabilityAddon are created and metrics data are displayed on the Grafana UI
3. Navigate to the ACM - Resource Optimization dashboard
4. There's no data in CPU usage panel
5. This issue only on OCP 4.9(local-cluster or managed cluster), but other OCP versions seem working as expected.
6. I tried to run quey on local-cluster which is ocp 4.9, there's no result search back
sum(node_namespace_pod_container:container_cpu_usage_seconds_total:sum_rate{cluster="local-cluster"}) by (namespace)