This monitor was introduced to allow users of our service to track the validity and expiration of SSL Certificates configured on your account.

To configure an SSL Certificate monitor, navigate to the Website that you want to configure the monitor on and click ‘Options’ and ‘Edit Website’ in the top right corner of the dashboard.

Under ‘Assurance Monitors’ you can turn Domain Expiry, SSL Certificate, SSL Cipher, Security Headers, Safe Browsing and SEO Stats on/off.

You can only configure an SSL Certificate Monitor for SSL enabled websites. SSL enabled websites start with HTTPS:// whereas standard websites start with HTTP:// 

If SSL has been identified on your server you have the ability to enable the SSL Monitor.
Also, be sure to check our SSL Certificate Monitor Blog post.