Ansible templating with variables from inventory

inventory

[aws]
aws_u ansible_host=5.5.1.1

[k8s]

[arub]
flok ansible_host=8.2.2.5

[py3-hosts]
aws_u

[py3-hosts:vars]
ansible_python_interpreter=/usr/bin/python3

[telegraf_clients:children]
aws
k8s
arub


[prometheus]
dev ansible_host=1.1.6.1

playbook.yml

---

# Telegraf
- hosts: telegraf_clients
  become: true
  tasks:
    - name: check or create directory /usr/local/bin
      file:
        path: /usr/local/bin
        state: directory
        mode: 0755
        
[...]

# Prometheus 
- hosts: prometheus
  become: true
  tasks:
    - name: copy prometheus config file
      template:
        src: ./files/prometheus.j2
        dest: /mnt/prometheus/config/prometheus.yml

prometheus.j2

scrape_configs:
{% for host_group in telegraf_clients %}
  - job_name: '{{ host_group }}' 
    scrape_interval: 10s 
    static_configs:
      - targets: [{% for host_ip in host_group %}'{{ host_ip }}:9126'{% if not loop.last %},{% endif %}{% endfor %}] 
{% endfor %}