How to check and monitor SSL certificates expiration with Telegraf

As a developer or operator of a Website, the certificate expiration could happen and make the services not work. I’ll introduce how to monitor certificates like SSL,JKS,P12 using Telegraf.

Certificates are broadly used for security reasons, they can be used within internal service or public service communication. The most common certificate is TLS used for verifying the identity of the HTTPS service. To increase security, the certificate will not be always valid because of expiration. To prevent the certificate expiry, we should rotate them periodically and meanwhile monitor them and alert if expired. Telegraf is a popular metric collecting tool to implement this.