View scaling activity and logs

The Scaling Activity tab is the log of an Auto Scaling Group. It lists every time the group added or removed VMs and every change to its settings, with the reason and who or what did it. Use it to find out why the VM count changed.

Before you begin

• An Auto Scaling Group in your project. See Create an Auto Scaling Group.
• Permission to read VMs in the project. See TIR Access Control.

Open Scaling Activity

In Auto Scaling Groups, select the group’s name and go to the Scaling Activity tab. Above the activity list, a summary sets out the rules the group follows: its capacity range and any hold on it, its target and scaling behavior on a Usage-based group, or its schedules on a Scheduled group, where usage is not watched. When the group has schedules, they are listed there too.

Read the activity list

The list has scaling events and settings changes together, newest first, by day and time. Each scaling entry says how many VMs were added or removed, the count before and after, how long it took, who or what did it, and why:

Cause	Reason
Usage	“CPU utilization reached 82% (target 60%).”
Schedule	“Scheduled policy “” fired.” or “A scheduled window ended, returning the group to its standing capacity.”
Manual resize	“A manual resize increased the group to N VMs.”
End of a manual hold	“A temporary manual hold expired, returning the group to its standing capacity.”

A change of the saved range reads “Minimum raised”, “Minimum lowered”, “Maximum raised” and so on, with “min 2 → 3”.

Settings entries say what happened: the group was created, updated, resized, relaunched, started, stopped or deleted, a start or stop was requested, an action failed, or SSH keys were updated. A replaced VM comes with its reason, for example “Replaced because the VM never became ready”, a failed launch with why it failed, and a skipped schedule with “Scheduled change skipped”.

By is the email of the person who did it, or Autoscaler, Schedule or System. It is a dash for a person whose account has been removed.

Filter, search and export

• Type in Search activities, reasons or people to narrow the list.
• Filter by All, Automatic or Manual. Manual means a person did it. Automatic means the platform did it, through usage, a schedule or a replacement.
• Select Export, then Download CSV or Download JSON, to save the filtered list. The file is named <group name>-activity.

The Overview tab has a Scaling Activity chart with ranges such as 1h, 1d and 7d, and Recent Activity with the five newest entries. See Monitor an Auto Scaling Group.

Check that your change was recorded

After a change, such as Scale Now or an edit, a new entry tops the list, with your email under By.

To change what makes the group scale, see Edit an Auto Scaling Group. For help when a group scales differently from what you expect, see Troubleshooting TIR Auto Scaling Groups.