When trying to deploy the samples from the documentation (https://docs.openshift.com/container-platform/4.15/monitoring/cluster_observability_operator/configuring-the-cluster-observability-operator-to-monitor-a-service.html), openshift raises an error, as v1 version is deployed:

oc get crd servicemonitors.monitoring.rhobs -o yaml

  names: 
    categories: 
    - rhobs-prometheus-operator
    kind: ServiceMonitor
    listKind: ServiceMonitorList
    plural: servicemonitors
    singular: servicemonitor
  scope: Namespaced
  versions: 
  - name: v1

On the other hand, when creating a servicemonitor in v1, it seems the operator is not acting in any way.