When installed by a namespace admin rather than a cluster-admin, the permissions of the operator service account become more crucial. In the log this error is displayed:

{"level":"info","ts":1615887201.6337137,"logger":"cmd","msg":"failed to create or get service for metrics: services \"fuse-apicurito-metrics\" is forbidden: cannot set blockOwnerDeletion if an ownerReference refers to a resource you can't set finalizers on: , <nil>"}
{"level":"info","ts":1615887201.6337326,"logger":"cmd","msg":"Could not create metrics Service","error":"failed to create or get service for metrics: services \"fuse-apicurito-metrics\" is forbidden: cannot set blockOwnerDeletion if an ownerReference refers to a resource you can't set finalizers on: , <nil>"}

The reason being that the service-account lacks the deploy/finalizers update permission so is unable to create the metering service. However, this permission must be granted as part of a CLUSTER-ROLE rather than a mere ROLE.