Show HN: LetsMonitor.org beta – free monitor for website certificate expirations

This works on all website certs, not just LetsEncrypt ones.

Yes, LetsMonitor will send alerts when the site is down or the certificate cannot be acquired

You can see the full log of errors with diagnostics from the 'Results Log' menu item. You're right, there should be a link to the log from the dashboard items.

Right now every hour (it may change). The service round robins checks from monitoring stations basically at AWS and Rackspace datacenters. This makes sure the site is reachable from points around the planet and that the certificate is functioning properly. So, in a way it can be used as an external site monitor for downtime. However, that is not its main purpose.