A lot of teams treat TLS renewal as a solved problem.
Set up ACME once, let it run, and forget about it.
That is exactly why certificate failures still cause outages.
Renewal success does not guarantee that:
the right cert was deployed,
the service reloaded,
DNS validation still works,
or the live endpoint is serving the new certificate.
Automation helps.
Independent verification is what makes it safe.
https://levelup.gitconnected.com/why-tls-auto-renewal-still-breaks-in-2026-8fbfc2763b94
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