Amazon(AWS)から以下のようなメールが届きました。
このブログはCloudFrontを通しつつ、AWSのCertificate Manager(ACM)で無料のSSL証明書を利用しているのですが、どうもSSL証明書が自動的に更新されたっぽい!?

Greetings from Amazon Web Services,

This notification is to notify you that AWS Certificate Manager (ACM) has completed the renewal of an SSL/TLS certificate that certificate includes the primary domain blog.katsubemakito.net and a total of 1 domains.

AWS account ID: xxxxxxxxxxxx
AWS Region name: us-east-1
Certificate identifier: arn:aws:acm:us-east-1:xxxxxxxxxxxx:certificate/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

Your new certificate expires on Jan 22, 2020 at 12:00:00 UTC.
If you have questions about this process, please use the Support Center at https://console.aws.amazon.com/support to contact AWS Support. If you don’t have an AWS support plan, post a new thread in the AWS Certificate Manager discussion forum at https://forums.aws.amazon.com/forum.jspa?forumID=206

This notification is intended solely for authorized individuals for blog.katsubemakito.net. To express any concerns about this notification or if it has reached you in error, forward it along with a brief explanation of your concern to validation-questions@amazon.com.

Sincerely,
Amazon Web Services

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