Same Subdomain on different domains

Traefik Traefik v2 (latest)
1

Heho
I know it's possible to map wildcard domains on the same service.
HostRegexp(example.com , {subdomain:[a-z]+}.example.com )

But is it also possible with activated TLS Letsencrypt to catch the same subdomain on different domains?
eg:
monitor.domainA.tld
monitor.domainB.tld
monitor.domainC.tld
...

It should be dynamically so it must be something like monitor.*

2

I don’t think that works, the main domain (after *.) must always be declared, for LetsEncrypt wildcards with main/sans.

3

Thank your for your answer

Thats not good. I think I need to go the way over a script that reads the logs and generating a configfile if it detects a new monitor.*. tld