The method for uninstalling Google Cloud Migrate for Compute Engine (formerly Velostrata) depends on how you were using it.
The method of uninstallation is different depending on if you were migrating from another cloud into GCP (cloud-to-cloud migrations) or if you were migrating from on-premises to GCP.
In this scenario you have cloud to cloud migration, the process for uninstallation is given below.
To uninstall Migrate for Compute Engine using the Migrate for Compute Engine Web Manager:
Login to and click Target Cloud.
Select the applicable Cloud Extension and click Delete. If there are any remaining workloads managed by Migrate for Compute Engine on this cloud extension, the operation aborts and you have a choice about how to proceed. You can either detach and clean-up, or move the workloads back to the source cloud using Wave management. Repeat the cloud extension deletion operation.
Repeat the previous step for all Cloud Extensions.
Delete the Velostrata Manager instance using the GCP console.