Delays and errors through DNS entry

For me Cloudflare triggers a timeout error 522:

Error 522

Ray ID: 712267627a2c00b6 • 2022-05-27 23:06:55 UTC

Connection timed out

This normally indicates that the origin behind Cloudflare (your server) is not responding in time.
How to solve these errors and what exactly they mean, can be found here, by clicking these links: