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The Official Blog of Mackerel

【Announcement】Support Window closed during the Obon holiday & a reminder for Mail System Maintenance

Thank you for choosing Mackerel.

Support Window closed during the Obon holiday

This announcement was previously made in the update announcement blog below.

Official Mackerel support (the "Feedback" option displayed in the upper right corner of the header while logged-in to Mackerel as well as correspondence/inquiries to will be closed during the Obon holiday through the following dates.

Support window closed period:Aug. 13th, 2018 (Mon.) ~ Aug. 15th, 2018 (Wed.) (JST)

Inquiries received during this period will be replied to in order on Thursday, August 16th. Thank you for your cooperation.

Mail System Maintenance on August 14th, 2018 (Tues.)

Also, as previously announced, the mail system that Mackerel uses is scheduled for maintenance on Tuesday, August 14th, 2018.

Check out the following entry for details.

mackerel-plugin-mssql release etc.

Hello! Mackerel team CRE Miura (id:missasan) here.

This week, we have two Windows related releases! If you’re a Windows user, be sure to check out the details.

Now on to the update information.

mackerel-plugin-mssql release

Mackerel-plugin-mssql, a metric plugin for monitoring Microsoft SQL Servers has been released. This plugin is Windows-only and is included in the Windows installer (msi file). If using, please download and update to the latest msi file.

For more details on how to use the plugin, see the README below.

Auto retire feature added to mackerel-agent for Windows

We’ve added a feature to automatically perform the retirement process from Mackerel when shutting down with a Windows server.

See the link below for configuration details.

In some cases, auto retirement may not execute normally such as when shutting down the server using the public cloud feature.

  • When the OS standard shutdown process is not executed
  • When network connection fails during the auto retirement process


Before starting this operation, first confirm that the automatic retirement process is executed as expected in your environment.

Improvements made to mackerel-plugin-mysql metric value calculation method

The metric value calculation method of MySQL innodb Transactions for mackerel-plugin-mysql has been improved. This fix is applicable to MySQL 5.6.4 and later.

Announcement for mail system maintenance on August 14, 2018 (Tue.)

Thank you for choosing Mackerel.

This is an announcement to notify that the mail system that Mackerel uses will be under maintenance.

  • Date and time: August 14th, 2018 (Tue) 9:00 p.m. - 1:00 a.m. on August 15th, 2018 (Wed) JST
  • Range of impact: All mail sent from Mackerel (user registration, alert notifications, etc.) may face delayed delivery during the above time period
  • Reason for Maintenance: This maintenance period was scheduled by SendGrid, the mail delivery service used by Mackerel. For details, please visit SendGrid’s status page (

Please refer to SendGrid’s status page mentioned above for information and updates on the mail system during the maintenance period.

We apologize for the inconvenience.

Thank you for your cooperation and thank you for choosing Mackerel.

Amazon Linux 2 official version now supported etc.

Hello! Mackerel team CRE Miura (id:missasan) here.

The other day, fellow CRE Inoue (id:a-know) presented at an event called Support Engineer Night vol.3. His presentation introduced technologically challenging cases unique to server monitoring services, and gave a glimpse of the other side of Mackerel support.

(Japanese only)

Now on to the update information.

Amazon Linux 2 official version now supported

Access the one-liner install script in the help page below.

Along with support for the official Amazon Linux 2, cookbook-mackerel-agent 3.1.0 has been released. mackerel-agent can be installed on official Amazon Linux 2 via Chef. Please use this cookbook with Chef 14.3.36 or later.

Additionally, various provisioning tools are being updated to support the official version of Amazon Linux 2 and we recommend that you also update these tools as necessary.

Notice for Obon holiday【8/13(Mon.)- 8/15(Wed.)】

The Mackerel team will be out of the office from August 13th (Friday) until August 15th (Wednesday) for the Obon national holiday. During this period, the support window will be closed (except for emergencies). Thank you for your cooperation and have a great summer vacation everyone!

Notice of database maintenance completion on 7/18(Wed.)

Mackerel Team Director id:daiksy here.

This is an announcement to report that the planned database maintenance scheduled for July 18th, 2018 (Wed.) was successfully completed without incident.

Maintenance work started on schedule at 3:00 p.m. (Japan time) and was completed at 8:00 p.m. as the result of two extension periods. We understand that this extended period of system stoppage was an inconvenience and we greatly appreciate your cooperation.

Maintenance time period overview

Operations were carried out in the following sequence.

  • 3:00 p.m. ~ 4:30 p.m.: System shutdown and implementation of database maintenance
  • 4:30 p.m. ~ 6:00 p.m.: Confirmation of operation. High-capacity control for retransmission processing from mackerel-agent.
  • 6:00 p.m. ~ 7:00 p.m. :1 hour extension of maintenance period. Continued high-capacity control for retransmission processing from mackerel-agent.
  • 7:00 p.m. ~ 8:00 p.m. : Additional 1 hour extension with only connectivity monitoring component stopped. Observation of mackerel-agent’s retransmission processing and restoration of connectivity monitoring component.

At 8:00 p.m., all features were confirmed re-operational and the maintenance period ended.

This concludes the maintenance report.

Here at Mackerel, we will continue to do our best to maintain a stable work environment for our users in the future. Thank you for your cooperation and thank you for choosing Mackerel.

mkr v0.31.1 Docker Image release etc.

Hello! Mackerel team CRE Miura (id:missasan) here.

Since the end of the rainy season, the heat has been relentless. Everyone please be sure to take good care and avoid heat stroke.

Now on to the update information.

mkr v0.31.1 Docker Image release

Access the Docker Image here. In the future, we plan to provide a new Docker image for each mkr command update. Use it to build development environments and to simplify and optimize version control.

Mackerel Meetup #12 on August 2nd (Thurs.)!

Mackerel Meetup # 12 will be held on Thursday, August 2nd! This time, Drecom was nice enough to let us use their seminar room for the venue.

At the event, user sessions will be held by two guests and the Mackerel team will present on the latest developments and the soon to be released anomaly detection feature.

Come and help us celebrate our achievement of 200 consecutive weeks of releases at this event! (Japanese only)

Retry option added to the mkr throw command

Hello! Mackerel team CRE Miura (id:missasan) here.

We just announced last week that we will no longer be sticking to our previous schedule of consecutive weekly releases, but we already have a new update to deliver. In the future, we would like to actively introduce new update information in this way, by making announcements via this blog and the newsletter when releases are made.

Now on the update information.

Retry option added to the mkr throw command

In mkr v0.31.1, when posting metrics using the mkr throw command, you can now specify to retry failed posts and the number of attempts by attaching the --retry N option. Using this option, you can lower the possibility of data loss when metrics can’t be posted, such as when a request accidentally fails or when Mackerel is under maintenance. Please note that retries will not be carried out if an HTTP error such as 403/404 occurs.

Update the mkr command and give it a try!