Email notifications now available for events such as host registration and monitor changes and more

Hello. Mackerel team CRE Inoue (id:a-know) here with another update announcement.

Email notifications now available for events such as host registration and monitor changes

Up until now, event notifications for things like registering a host in Mackerel and changes to monitors were only supported for some notification channels such as Slack and Webhook.

Now, these notifications are also available for email as well.

We hope that email notifications will help you stay on top of the unexpected.

New metric targets added for AWS・S3 Integration

Two types of metrics have been added, Bucket Size and Number Of Objects. See the help page linked below.

Please note that both are daily metrics.

OSS Updates

Today’s update covers a wide range of OSS products.



  • [check-postgresql] Added support for the sslrootcert option used to encrypt plugin communication


  • CPU / memory metrics for container-agent now available with Kubernetes 1.18 and later.
    • Additionally, a get operation (verb) is no longer required for the nodes/spec resource in the RBAC configuration of Kubernetes (EKS on Fargate).


  • [monitors subcommand] Support added for alertStatusOnGone (specifying the alert status when an alert occurs) with push pull.

Thank you to everyone who contributed!

Support availability during the year-end and New Year holidays

The end of the year is fast approaching with less than three weeks left in 2020. And thank you for choosing Mackerel this year.

Mackerel’s official support window will be closed from December 28, 2020 (Thursday) until January 3, 2021 (Sunday).

For those of you planning to look over your Mackerel settings etc. before the end of the year and New Year holidays, we recommend you do so as soon as possible. And if you have any questions or concerns, please do not hesitate to contact us.

Mackerel’s Official Support Request Form