Ngnix certificate renew

It is not a good way. Many people (poorly) try to renew on those hours and creates a large demand on Let's Encrypt systems. This leads to more renewal errors. A better approach is to follow instructions here:
Certbot may have already set a cron or systemd timer for you. That topic also shows how you can check


certbot on Ubuntu 20 should have setup its' own systemd timer for such renewals.
systemctl list-timers | grep certbot


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