traefik/docs/content/routing/providers/service-by-label.md

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In general when configuring a Traefik provider,
a service assigned to one (or several) router(s) must be defined as well for the routing to be functional.
There are, however, exceptions when using label-based configurations:
1. If a label defines a router (e.g. through a router Rule)
and a label defines a service (e.g. implicitly through a loadbalancer server port value),
but the router does not specify any service,
then that service is automatically assigned to the router.
1. If a label defines a router (e.g. through a router Rule)
but no service is defined, then a service is automatically created
and assigned to the router.
!!! info ""
As one would expect, in either of these cases, if in addition a service is specified for the router,
then that service is the one assigned, regardless of whether it actually is defined or whatever else other services are defined.