The documentation and my own experience states exaclty that, if data source program is used.
I Frankensteined it on my own. This does nothing special and I don’t know why the code is relevant when I posted the output. But for clarification: simple webcheck script ($1996520) · Snippets · GitLab
This script gives you EVERY certificate the webserver sends. Like this:
➜ webmonitor git:(master) ✗ ./webcheck.rb https://cloud.home.example.com
<<<local>>>
0 webcheck-cloud.home.example.com time=709ms https://cloud.home.example.com
0 certificate-cloud.home.example.com lifetime=47 Certificate: cloud.home.example.com
0 certificate-cloud.home.example.com-chain-1 lifetime=243 Certificate: Let's Encrypt Authority X3
0 certificate-cloud.home.example.com-chain-2 lifetime=47 Certificate: example.tech
0 certificate-cloud.home.example.com-chain-3 lifetime=243 Certificate: Let's Encrypt Authority X3
0 certificate-cloud.home.example.com-chain-4 lifetime=47 Certificate: srv01.home.example.com
0 certificate-cloud.home.example.com-chain-5 lifetime=243 Certificate: Let's Encrypt Authority X3
2 certificate-cloud.home.example.com-chain-6 lifetime=-209 Certificate: wiki.example.com
0 certificate-cloud.home.example.com-chain-7 lifetime=243 Certificate: Let's Encrypt Authority X3
0 certificate-cloud.home.example.com-chain-8 lifetime=47 Certificate: yt.example.tech
0 certificate-cloud.home.example.com-chain-9 lifetime=243 Certificate: Let's Encrypt Authority X3