Right now, the CO can only configure the namespaces which it will watch. Within these namespaces, all custom resources will be watched and reconciled. It would be useful to be also specify some additional label selector to reconcile only clusters with some specific labels.

That will allow for example to have two operators running in parallel and watching the same namespace and one reconciling only CRs with label operatorVersion: 0.22 while another one will do resources with operatorVersion: 0.23. Strimzi should allow it to configure these label selectors. User should be still responsible to configure them in the way that every resource is reconciled by one operator.