There’s lots of monitoring services out there that do it. A long time ago I worked at place that used a service called site24x7 for cert and API monitoring. That was before Pingdom kinda got better than most API monitoring services, but I don’t know if they monitor cert expiry.
Taking a look around, you’ll find lots of service providers, or tools you could use. But the main issue is all they do is tell a human being to do something, which they can still fail to do. Which is why automating cert rotation (with things like let’s encrypt or ACM) is arguably a better solution than monitoring it.
Taking a look around, you’ll find lots of service providers, or tools you could use. But the main issue is all they do is tell a human being to do something, which they can still fail to do. Which is why automating cert rotation (with things like let’s encrypt or ACM) is arguably a better solution than monitoring it.