Migrate a deprecated terraform property, by applying a JQ script directly to the state file

autoscaling_attachment_alb_target_group_arn.jq

#!/usr/bin/env jq

# Apply to a Terraform state file, to replace the deprecated alb_target_group_arn attribute with lb_target_group_arn on each aws_autoscaling_attachment resource.

(
    (.resources | .[] | select(.mode=="managed") | select(.type=="aws_autoscaling_attachment")).instances
    | .[]
) |= (
    .attributes |= (
        (.lb_target_group_arn = .alb_target_group_arn)
        | del(.alb_target_group_arn)
    )
)