For a fun project it certainly is a fun idea. In real life, I guess there are people who don't monitor at all. For them failing requests would go unnoticed ...

For a fun project it certainly is a fun idea. In real life, I guess there are people who don't monitor at all. For them failing requests would go unnoticed ... for the others monitoring must be easy. But I think the core thing might be to make monitoring SSL lifetime the "obvious" default: All the grafana dashboards etc should have such an entry. Then as soon as I setup a monitoring stack I get that reminder as well.