It's relevant to the discussion. No other server with ACME supports multiple iss...

diftraku · on Aug 20, 2021

For what it's worth, Traefik does allow you to change the server you talk to (it's just the staging server for LE they use in the example): https://doc.traefik.io/traefik/v2.0/https/acme/#caserverand

A quick google does suggest that at least one person has tried using ZeroSSL with Traefik: https://spad.uk/get-free-zerossl-certs-using-traefik/

francislavoie · on Aug 20, 2021

Yes you can configure Traefik with other issuers, but it does not support having multiple configured at the same time and failing over between them in case something goes wrong. That's the point being made in the article. Caddy does this.