Investigate and Document Undeclared Variable Warnings

Problem/Feature Description

A junior engineer submitted a Terraform configuration that passes terraform validate but tflint is reporting several warnings about variables. The team lead is not sure whether these warnings are safe to ignore — the code "works" in the dev environment — and has asked you to investigate, document what these warnings mean and why they matter, and produce a remediated version of the configuration.

Run the full validation workflow on this configuration, pay special attention to any variable-related lint findings, and produce both a findings report and a corrected version of the configuration that resolves the variable declaration issues.

Output Specification

Produce:

• validation_report.md: Full validation results documenting every step
• fixed/variables.tf: A corrected variables file that resolves any variable declaration issues found
• fixed/main.tf: A copy of main.tf if any changes are required there

Input Files

The following files are provided as inputs. Extract them before beginning.

=============== FILE: terraform/main.tf =============== terraform { required_version = ">= 1.0" required_providers { aws = { source = "hashicorp/aws" version = "~> 5.0" } } }

provider "aws" { region = var.aws_region }

resource "aws_instance" "app" { ami = var.ami_id instance_type = var.instance_type subnet_id = var.subnet_id

tags = { Name = "${var.app_name}-${var.environment}" Owner = var.owner_email CostCenter = var.cost_center } }

resource "aws_eip" "app" { instance = aws_instance.app.id domain = "vpc" }

=============== FILE: terraform/variables.tf =============== variable "aws_region" { description = "AWS region" type = string default = "us-east-1" }

variable "ami_id" { description = "AMI ID" type = string }

variable "instance_type" { description = "Instance type" type = string default = "t3.micro" }

=============== FILE: terraform/terraform.tfvars =============== ami_id = "ami-0c55b159cbfafe1f0" instance_type = "t3.small" subnet_id = "subnet-12345" app_name = "payments" environment = "staging" owner_email = "team@example.com" cost_center = "CC-1234"