Missing double quote in nodeSelector field under MultiClusterObservability custom resource in point "2." in section "1.3.2.3. Creating the MultiClusterObservability custom resource" of the below documentation.

https://docs.redhat.com/en/documentation/red_hat_advanced_cluster_management_for_kubernetes/2.11/html-single/observability/index#creating-mco-cr

 ~~~
nodeSelector:
node-role.kubernetes.io/infra:

~~~

It should be like below:

~~~
nodeSelector:
node-role.kubernetes.io/infra: ""
 ~~~

Operator overwrites the nodeSelector if used without double quote in MultiClusterObservability CR.