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 The Terraform plan logs list resources which shall be updated in-place separately from those which will be newly added  or destroyed. The tilde character (~) also  flags resources/attributes that trigger an in-place update. For example, below is the planned in-place update for the instance, triggered by a change in its virtual image, from "Ubuntu 22.04 NVIDIA_AI" to "ubuntu-22.04-20250604054912" :

  # module.web_server.openstack_compute_instance_v2.instance will be updated in-place
  ~ resource "openstack_compute_instance_v2" "instance" {
        id                  = "552f77d0-dc87-4de8-bc58-93c0b324761a"
      ~ image_name          = "Ubuntu 22.04 NVIDIA_AI" -> "ubuntu-22.04-20250604054912"
        # (16 unchanged attributes hidden)