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The GCP managed instance group (manual) target controls a group’s target size directly. Use it for a managed instance group whose size is owned through resize operations. Arklow clamps each requested size to the target’s minimum and maximum before sending the resize operation. Google Cloud may take time to create or remove instances, and Arklow continues observing the group while it converges.
A Google Cloud autoscaler can overwrite direct resize operations. Use the autoscaler floor target for a group managed by an autoscaler.

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Configuration

This mode uses the shared group fields. It has no autoscaler field. The target’s Minimum replicas and Maximum replicas bound every requested group size.

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Required permissions

The selected GCP Service Account credential needs:
You can place these permissions in a custom role scoped to the project containing the group.

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Add a desired-count target

1

Enable managed instance groups

Open the GCP Service Account credential and enable Google Cloud managed instance groups under Scale target providers.
2

Sync the inventory

Click Sync now and open Scale Targets.
3

Choose the group

Select the managed instance group under Provider inventory and click Attach.
4

Select capacity

Choose the destination or shared pool served by the group.
5

Set the replica range

Enter the minimum and maximum group sizes Arklow may request.
6

Attach

Attach the target and confirm that the observed target size belongs to the expected group.