Dashboard 404 after upgrading from v2

[bluepuma77]

You should use the same router name for all labels:

@mlsh0

    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.dashboard.rule=Host(`traefik.local.X`) && (PathPrefix(`/api`) || PathPrefix(`/dashboard`))"
      #                       ^
      - "traefik.http.routers.traefik.entrypoints=websecure"
      - "traefik.http.routers.traefik.service=api@internal"
      - "traefik.http.routers.traefik.middlewares=auth@file"