We had downtime once the certificate of the issuer of ours expired. Thus the SSL trust "chain" was broken an browsers no longer accepted our SSL certificate.
(Of course they annouced that via some channels, which our SSL reseller forgot to forward.)
A useful addition, or premium feature, would be to also scan the SSL certificate chain.
My name is Robert and I'm the creator of Monitoria.
I've submitted Show HN around 2 months ago but it didn't get any traction [1].
Since then I introduced a free plan and SSL certificate monitoring.
Please check it out and let me know what you think. I'll be happy to hear any feedback.
Thank you very much!
Robert
[1] https://news.ycombinator.com/item?id=24768929