The documentation here [1] at point 4 reports creating a ClusterLogging instance with the field `.metadata.name` named `cr-lokistack` which is something not allowed by the Operator: 
—
"The ClusterLogging "cr-lokistack" is invalid:

• metadata.name: Unsupported value: "cr-lokistack": supported values: "instance"
  Its name should be `instance` instead of `cr-lokistack`.

[1] https://docs.openshift.com/container-platform/4.11//logging/cluster-logging-loki.html#logging-loki-deploy_cluster-logging-loki