How to know when certificates fail to renew

Hey, I’m also building a hosting service with Caddy. However, my concern is how do I get to know when Caddy is unable to generate SSL certificate for a domain or if there are errors while renewing an already configured domain?

You should watch Caddy’s logs for errors.

Please open a new thread if you have any issues.

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I split this out into a new thread for you.

Adding on Francis’ answer, you can use any monitoring/alerting service you prefer!