Question about "classic-rest-service"

[bookin]

In the Survival Guide I see this information for "classic-rest-service":

Microservice	Protocol	Deployment or StatefulSet	Node Pool Assignment	Autoscaling Supported	Description
classic-rest-service	REST/HTTP	StatefulSet	analytics or system	Yes (CPU or custom metric)	REST service for supporting non-RPC connector plugins.

But in the default replicas.yaml properties this service doesn't have autoscaling settings.
Plus, if manually scale this StatefulSet and check get top pod metrics you can see that always work only one Pod and the system doesn't does not distribute loads between few pods, so I have to give this Service a lot of memory and CPU resources.

Could someone describe me why it happens and where I can be wrong?
Thanks