Hello! This is Toya (
id:KGA) from the Mackerel CRE team. Here are the latest updates.
- OK notifications are now sent when alerts are closed due to host retirement
- Series selection is now preserved when you change the display period in a query graph's full-screen view
- Added Ubuntu 26.04 LTS (Resolute Raccoon) to the supported OSes
- Updates to various plugins
OK notifications are now sent when alerts are closed due to host retirement
As previously announced, OK notifications are now sent when alerts are closed as a result of a host being retired.
Previously, when a host was retired, any open alerts for that host were automatically closed, but no OK notification was sent at that time. With this update, an OK notification is now sent when an alert is closed due to retirement, so you can confirm through a notification that an alert was closed because of the retirement.
Please note that this change may increase the number of notifications you receive.
Series selection is now preserved when you change the display period in a query graph's full-screen view
When you displayed a query graph for labeled metrics in full screen, selected only specific series, and then changed the display period, the series selection was previously cleared and all series were shown again. As a result, when you wanted to move the display period back and forth while focusing on specific series, you had to re-select the series each time you changed the period.
With this update, your series selection is now preserved even when you change the display period. This lets you move through different periods and review the graph while staying focused on the series you want to see.
Added Ubuntu 26.04 LTS (Resolute Raccoon) to the supported OSes
We have added Ubuntu 26.04 LTS (Resolute Raccoon) to the list of supported OSes for mackerel-agent. For Mackerel's current supported environments, please see the help page.
Updates to various plugins
We have released several plugin updates. Here are the details.
mackerel-plugin-nginx can now skip TLS certificate verification
We added a -tls-skip-verify option to mackerel-plugin-nginx. When nginx publishes its status over HTTPS only and uses a self-signed certificate or similar, metric collection could previously fail during certificate verification. By specifying this option, you can skip certificate verification and collect metrics.
This update was contributed by Mackerel user 
id:sfujiwara. Thank you!
Available in mackerel-agent-plugins v0.91.0 and later.
mackerel-plugin-aws-ec2-ebs can now use the CloudWatch GetMetricData API
We added a -use-get-metric-data option to mackerel-plugin-aws-ec2-ebs. When you specify this option, the CloudWatch API used to retrieve metrics changes from GetMetricStatistics to GetMetricData. Because multiple metrics can be retrieved together, you can expect a reduction in the costs associated with CloudWatch API usage. Note that when using this option, you need to grant the cloudwatch:GetMetricData permission in your IAM policy.
Available in mackerel-agent-plugins v0.91.0 and later.
Changed the supported version of mackerel-plugin-mongodb
As previously announced, we have changed the supported target of mackerel-plugin-mongodb to MongoDB 4.2 or later. If you are using MongoDB 4.1 or earlier, please note that updating the plugin may cause it to stop working.
