Consul k8stag implications

I need your expert opinion on consul k8stag implications & exact usage of this tag.

  1. Whats the exact use of k8stag in k8s consul agent.
  2. What will be the impact if add k8stag into existing/running k8s consul.
  3. What will be the impact if i keep different for ConsulPrefix & k8stag:

ex:
consulPrefix: dev-
k8sTag: test

  1. What will be the impact if i keep same for ConsulPrefix & k8s tag:

ex:
consulPrefix: dev-
k8sTag: dev