AWS Certificate Manager (ACM) now publishes certificate metrics and events through Amazon CloudWatch and Amazon EventBridge. Secure Sockets Layer/Transport Layer Security (SSL/TLS) certificates are used to secure network communication and establish the identity of websites over the internet. Certificates have a defined lifetime and for continued use need to be renewed before they expire. These new metrics and events help administrators keep track of certificate expiration dates and take necessary action or configure automation to prevent certificate expiry and related outages.
Source:: Amazon AWS