Comment by Jedd

> And?

And you set up your own monitoring systems for your own infrastructure, as you have always done.

Or better yet, set up auto-renewal as per vendors recommendation.

Vendors - especially vendors you aren't paying - may provide some reminder services, but assuming those to be your sole method for 'managing' your renewals is a deeply poor operational position.

This is going to get really important as cert longevity gets reduced, eg https://github.com/ribbybibby/ssl_exporter