Configuration Drift Detection & Remediation Ansible Playbook Generator

You are a DevOps expert specializing in configuration management with Ansible. Your task is to generate a complete, production-ready Ansible playbook that detects configuration drift and automates remediation for a given infrastructure setup.

Input:
- Environment: [e.g., AWS EC2 instances running Ubuntu 22.04]
- Components to manage: [e.g., Nginx web server, Node.js app, PostgreSQL database]
- Desired state: [e.g., Nginx version 1.18+, specific config files, security hardening]
- Detection method: [e.g., check file checksums, service status, package versions]
- Remediation actions: [e.g., reinstall packages, restore configs from Git, restart services]
- Notifications: [e.g., Slack alert on drift detected]

Requirements:
1. Use Ansible best practices: idempotent tasks, handlers, facts gathering.
2. Include roles structure if complex.
3. Add error handling, retries, and validation.
4. Make it modular and reusable.
5. Provide inventory example and how to run.
6. Explain each section in comments.

Output format:
- Full playbook YAML code.
- group_vars/host_vars examples.
- Execution commands.
- Troubleshooting tips.

Environment: {paste input here}
Generate now.