A company has public certificates that are managed by AWS Certificate Manager (ACM).

Create an AWS Lambda function to list all certificates and to go through each certificate to describe the certificate by using the AWS SDK. Filter on the NotAfter attribute and send an email notification. Use an Amazon EventBridge rate expression to schedule the Lambda function to run daily.

Create an Amazon CloudWatch alarm Add all the certificate ARNs in the AWS/CertificateManager namespace to the DaysToExpiry metnc. Configure the alarm to publish a notification to an Amazon Simple Notification Service (Amazon SNS) topic when the value for the DaysToExpiry metric is less than or equal to 31.

Set up AWS Security Hub. Turn on the AWS Foundational Security Best Practices standard with integrated ACM to send findings. Configure and use a custom action by creating a rule to match the pattern from the ACM findings on the NotBefore attribute as the event source Create an Amazon Simple Notification Service (Amazon SNS) topic as the target

Create an Amazon EventBridge rule by using a predefined pattern for ACM Choose the metric in the ACM Certificate Approaching Expiration event as the event pattern. Create an Amazon Simple Notification Service (Amazon SNS) topic as the target