-d flag can't contain a dot

[dn]

-d can't contain currently a dot because the exact string is used to create the labels for traefik. I took me a long while to figure out - I used as -d subdomain.foo and the containers never showed up on traefik - even if healthy.

Is it worth it to open a PR to change the documentation or alternative replace the . with a - when it's used as label?

[dhh]

I'd add a note to the documentation yes.