By design k8s ingress is only designed to ballance services from within
the namespace of the ingress.
This is disscuessed a little in
https://github.com/kubernetes/kubernetes/issues/17088.
For now traefik should only reference the services in the current
namespace. For me this was a confusing change of behaviour
from the reference implimentations, as I have services
with the same name in each namespace.
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