When UserWorkLoadMonitoring is enabled on the cluster, openshift-lifecycle-agent namespace generates an alert: PrometheusOperatorRejectedResources due missing label openshift.io/cluster-monitoring: true

4.16.38    

    Always

    1.Install LCA operator in default namespace (openshift-lifecycle-agent) without any extra options 
    2. Enable UserWorkLoadMonitoring on the cluster
    3.  

    PrometheusOperatorRejectedResources alert is triggered on the cluster   

    No alert is triggered

    https://issues.redhat.com/browse/OCPBUGS-39126

So as the LCA operator creates a ServiceMonitor, but the namespace does not have openshift.io/cluster-monitoring: true label present, UserWorkloadMonitor will try scrape the metrics, but that is blocked. 

Compared to other non-community or non-certificed operators the openshift.io/cluster-monitoring: true label is present on the namespace. 

Tested by labeling the openshift-lifecycle-agent Namespace manually and the alert is not present anymore.