Certificates that renew themselves
The most common outage we designed out entirely: an expired TLS certificate.
A surprising share of self-hosted outages come down to one thing: a certificate expired and nobody was watching the calendar. It is the most predictable failure in infrastructure, which makes it the most embarrassing.
Naasson Apps issues and renews certificates automatically for every domain it manages. Renewal happens well before expiry, the new certificate is validated before it is swapped in, and a failed renewal raises an alert while there is still plenty of runway to fix it.
The goal is that certificates become something you never think about — not because they are hidden, but because the failure mode has been removed rather than merely monitored.