If you followed DBTech tutorial, even though the tutorial was done 18th March 2020, it is outdated already.
Traefik is in fast developement, so things change frequently.
Change image: traefik:v2.0
also a good idea to change api.insecure=false and use the domain entry point (monitor.domainname.com) instead of the local entry point (192.168.x.x:8080)
and then restart Traefik.
Restart vis cli
docker-compose up -d
Restart via Portainer
go to Containers, select (tick checkbox) traefik