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🏷️ Feature Request Type

Other

🔖 Feature description

Uptime Kuma checks the time until certificates expire. It could also check for the validity based on their revocation status.

✔️ Solution

On top of alerting for outdated certs, it should also alert for revoked certs.

❓ Alternatives

No response

📝 Additional Context

Let's encrypt is in the process of revoking a number of certificates this week. The issued certificates would still be before their expiration date, but will nonetheless be causing security warnings for clients. This can't be fully avoided with this, but at least one would not be notified by users/clients but from the monitoring system.

More context: https://www.bleepingcomputer.com/news/security/lets-encrypt-is-revoking-lots-of-ssl-certificates-in-two-days/

While this supposed future enhancement will not help with this week's problem, it might help mitigate a potential future similar incident.