TLS Certificate Monitoring: Prevent Expiry Outages

An expired TLS certificate is one of the most preventable causes of service outages, yet it continues to take down websites and APIs at companies of every size. The fix is straightforward: monitor your certificates and get alerted before they expire. The hard part is remembering to set it up before the 3 AM page.

This guide covers why certificates expire unexpectedly, how to set up automated monitoring for all your endpoints, what alert thresholds to use, and how to integrate certificate checks into your existing monitoring workflow.