"You cannot create a ClusterLogForwarder resource named instance in the openshift-logging namespace, because this is reserved for a log forwarder that supports the legacy workflow using the Fluentd collector." 

This wording confused me during an engagement to believe that the CLF with name "instance" was for Fluentd collectors vs the newer Vector collectors. I tried for an hour to make a CLF not named "instance" but without the Multi log forwarder feature enabled. 

I eventually found out that "instance" CLF should be used when not using Multi Log Forwarding feature even if using Vector. 

A possible improvement is to note that the "instance" name is used for all non multi log forwarding configurations with different types of collectors (Fluentd and Vector)? I could still be misunderstanding the docs but additional documentation and clarify around the selected statement could help.