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The Official Blog of Mackerel

The Mackerel Ambassador Program has launched!


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

Here at Mackerel, we are extremely grateful for all of our users and their various activity regarding the Mackerel service.

Thanks to all of you and the positive feedback that’s been spread around, the word “Mackerel” can be heard on a regular basis over SNS and among the engineering crowd, known as a reliable choice and for its technical capabilities. In order to show our gratitude and give back, we’ve set up a new program called Mackerel Ambassadors!

As a perk, for those certified as an Ambassador, we now offer a special plan. With the Ambassador Plan, all features, including those only available with a paid plan as well as new features added in the future, can all be used free of charge. With this, we hope to receive even more honest feedback, so as to better understand the perspective of Mackerel users and their expectations. In addition, all feedback received will be used as a reference for future development and service operation.

The Mackerel team will contact you if you have been certified as an ambassador. Look forward to hearing from us!

How Ambassadors are selected

The Mackerel Ambassador Selection Committee will reach out to those who have been recognized to have utilized Mackerel in a profound way. They will directly contact users via email, SNS direct message, etc.

In the beginning, Ambassadors will be appointed through individual recommendations from the Mackerel team, but as the program grows, selections will be made based on the review of submitted applications.

The criteria for the process will not be made public.

The benefits of being an Ambassador

  • Use of the Mackerel Ambassador Plan
    • Register up to 10 hosts
    • Use all Mackerel features at no cost, including those in a paid plan
  • Novelty present priority
    • Apparel such as t-shirts and parkers
    • Stickers, Japanese style folding fans, pouches, glass cleaning cloth

Write a blog for the Ambassador Program

We are asking for Mackerel Ambassadors to submit a blog entry detailing their comments, impressions, or requests regarding a Mackerel feature that they put to use with the Ambassador Plan.

  • Thoughts or impressions of a feature
  • Feedback or requests for a feature
  • Things you like/don’t like about Mackerel

These are just some examples, so please feel free to write in more detail about whatever interests you. When we receive a blog entry, we’ll share the blog URL from Mackerel's official account and from individual Mackerel team member accounts etc. Depending on the content of the article, we may even share it on Mackerel's official blog.

Getting started

Regarding participation in the program, we will contact those who have accepted an ambassador position individually.

On January 23rd (Wed.), browsing for Mackerel documents will be unavailable for a short period of time between 1:00-3:00 a.m.

Thank you for choosing Mackerel.

Maintenance for Hatena Blog is scheduled to be carried out on January 23rd (Wednesday).

1月23日(水)午前1:00〜3:00ごろまでメンテナンスを行います - はてなブログ開発ブログ (Japanese only)

And because Mackerel documents are provided using the Hatena Blog feature, document browsing will be temporarily unavailable during the following time period.

Please note that this maintenance will not affect Mackerel's main service.

We apologize for the inconvenience and thank you for your understanding in our efforts to provide a more stable service.

Revisions to Mackerel’s Terms of Service

Thank you for choosing Mackerel.

Revisions have been made to the Mackerel Terms of Service. The revised content is as follows.

Terms of Service Japanese version

  • In Article 4 (Protection of Information), the fact that the user holds the rights to user posted data was added
  • Article 8 (Suspension and Cancellation of a Paid Plan by the User) was added
  • The existing Article 8 was converted to Article 9, and the following article numbers were shifted
  • Typos corrected

Terms of Service English version

Same as the above

Terms of Service (Mackerel for KCPS users)

Same as the above

This concludes the content revisions made to the Terms of Service.

Changes to credit card information will be temporarily unavailable due to payment system maintenance

Thank you for choosing Mackerel.

Due to maintenance of the payment system, the feature to edit credit card information will be temporarily suspended during the following time period.

  • Time period: January 15 (Tue) - January 25 (Fri)
  • Suspended feature: Changing / deleting credit card information
    • Changes to the credit card number and expiration date will be unavailable
    • New credit card registration and payments by existing cards will not be affected.
    • Customers who need to change their credit card information, please wait until after the maintenance has finished.

We apologize for the inconvenience and thank you for your understanding.

If you have any questions, please contact us through

Alert status colors now correspond with our color support themes and more

Mackerel team CRE Miura (id:missasan) here.

Happy new year! Here’s to another great year with Mackerel and the Mackerel team!

I hope everyone was able to relax over the New Year holidays. Our first announcement of 2019 is full of new content including a few things from the end of last year as well.

Now on to this week’s update information.

Alert status colors now correspond with our color support themes

Using a high contrast theme, the green color previously used to indicate “OK” for alert statuses has been changed to blue to more easily distinguish from Critical and Warning.

Mackerel Product Manager, Matsuki summarizes Mackerel’s approach to using color support themes in this article featured in the Mackerel Advent Calendar 2018. Check it out in the link below. (Japanese only) (Japanese only)

Graph images can now be displayed with Chatwork notifications

In Chatwork, related graph images can now be displayed with notifications. To enable this feature, check the box option "Alert notification with graph image". This feature is turned on by default.


A field has been added to the Webhook notification payload to return the time at which an alert opened/closed

A new field has been added to the JSON Webhook notification to return the time an alert is opened (alert.openedAt) and the time an alert is closed (alert.closedAt). Both are returned in epoch seconds.

Along with this, if you’re currently using alert.createdAt, we recommend switching to alert.openedAt.

limit parameters can now be specified with the alert list API

A limit parameter has been added that allows you to specify the maximum number of alerts to be retrieved with the alert list API. The maximum number of alerts that can be specified is 100. When this parameter is omitted, up to 100 alerts are retrieved.

Any value greater than 100 will be treated as a Bad Request.

AWS Integration now supported with S3 and more

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

Last week was full of events for the Mackerel team with the DevOps Hands-on Seminar, the Operations Management Solution Seminar, and Drink Up. Again, I was able to meet face to face with many users at this year’s events. Following the New Year, another event is already scheduled for January 23rd (Wednesday), a seminar on "Implementing AWS Operational Monitoring and Security Measures with Mackerel and WafCharm". There are others in the works as well. You won’t want to miss out on next year’s events!

Now on to this week’s update information.

AWS Integration now supported with S3

S3, one of the most highly used services of AWS, has finally been added to AWS Integration. Check out the help page linked below for more details.

Stacked graphs can now be displayed in custom dashboard role graphs

When adding a role graph to a custom dashboard, you now have the option of selecting either a stacked or line graph for the graph display.


The ON/OFF setting for experimental features has been removed

With this update, it is now unnecessary for the user to have to turn on the experimental features display. Experimental features are now always displayed.

See the help page linked below to check which features are currently experimental features.

“Implementing AWS Operational Monitoring・Security Measures with Mackerel・WafCharm” a seminar held on January 23rd!

Hatena and Cyber Security Cloud will be holding a seminar where we’ll talk about the best practices regarding AWS infrastructure operational monitoring and security solutions. The first part of the seminar will go over security automation in SaaS with AWS, the second part will be an explanation on Cyber Security Cloud's AWS WAF automatic operation service "WafCharm", and the final part will introduce the cloud type server monitoring tool "Mackerel" from Hatena. Don’t miss out! (Japanese only)

Event details

  • Date and time: Wednesday, January 23rd, 2019 3:00 p.m. ~ 5:30 p.m. JST (Reception starts at 2:30 p.m.)
  • Venue:Amazon Web Services Japan, Inc.
  • Address:〒153-0064 Tokyo, Meguro-ku, Shimomeguro 1-8-1, Arko Tower 14F Seminar Room
  • Access:5 minute walk from Meguro Station (JR · Tokyu Meguro Line · Tokyo Metro Namboku Line · Toei Subway Mita Line)

AWS has three offices in Meguro, so please be careful not to get mixed-up.

Our support window will be closed for the holidays

Thank you for choosing Mackerel.

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

Both ways of contacting our support team, either through or with the “contact our support team” option displayed in the upper right header when logged into Mackerel, will be closed during the following dates for the New Year’s holidays.

New Year’s holiday period :Tuesday, December 25th, 2018 - Thursday, January 3rd, 2019

Inquiries received during this period will be handled in the order received starting from January 4th, 2019 (Friday). Inquiries received by the morning of Friday the 21st (JST) will be answered before the end of the year. Thank you for your cooperation.