TrafficSplit root service

[jspdown]

Hi everyone 👋

In the TrafficSplit v1alpha3 spec an implementation example is given. It describes the behavior of the implementation as such:

When a new TrafficSplit object is created, it instantiates the following Kubernetes objects:

Service who's name is the same as spec.service in the TrafficSplit (web)
A Deployment running nginx which has labels that match the Service

When I read this example I understand that the root service doesn't have to exist and it's the job of the implementation to create the missing service.
Since this behavior is not clearly defined in the specification I would like some clarification. Does the root service must exist or it doesn't have to?

I don't see a lot of implementations implementing the behavior described in that example. So, a configuration working on one implementation wouldn't work on another.