You use Terraform to manage an application deployed to a Google Cloud environment. The application runs on instances deployed by a managed instance group. The Terraform code is deployed by using a…

Deleting and recreating the managed instance group would cause significant application downtime and would require multiple steps or pipeline runs, contradicting the goal of minimizing disruption and pipeline runs.

Manually adding a new instance template and then updating the MIG is a multi-step, less automated approach than using `create_before_destroy` within a single `terraform apply`.

Removing the managed instance group from the Terraform state file is an anti-pattern that breaks Infrastructure as Code principles and would not resolve the underlying issue of updating the instance template without disruption.

The `create_before_destroy = true` meta-argument in the `lifecycle` block ensures that Terraform creates the new instance template with the updated machine type before attempting to destroy the old one. This allows the managed instance group to roll out new instances gracefully, minimizing application disruption during the update in a single `terraform apply`.