.
├── README.md
├── using-ssh-pem
│   ├── hosts
│   ├── main.yml
│   ├── prometheus.yml
│   └── README.md
├── using-ssh-user-pass
│   ├── hosts
│   ├── main.yml
│   ├── prometheus.yml
│   └── README.md
└── using-ssh-user-pass-vault
    ├── hosts
    ├── main.yml
    ├── passwd.yml
    ├── prometheus.yml
    └── README.md

hosts file: ansible inventory with hosts and variables

https://docs.ansible.com/ansible/latest/user_guide/intro_inventory.html

main.yml: main file of ansible playbook. Roles was not necessary.

https://docs.ansible.com/ansible/latest/user_guide/playbooks_intro.html

prometheus.yml: prometheus file with targets.

https://prometheus.io/docs/prometheus/latest/configuration/configuration/

The using-ssh-user-pass folder is not recommended, because the password of root user and ssh is in plain text inside of the inventory file, ansible-vault is recommended.

https://docs.ansible.com/ansible/latest/user_guide/vault.html