Unable to install Prometheus and node exporter using collection from Ansible galaxy

[ceseuron]

I'm hitting a brick wall trying to deploy Prometheus with Ansible using the collection from Ansible Galaxy. I constantly get the below error

Debug output of ansible-playbook using -vvvv:

ansible-playbook [core 2.16.3]
  config file = /home/ceseuron/Repos/prometheus-deploy/ansible/ansible.cfg
  configured module search path = ['/home/ceseuron/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3/dist-packages/ansible
  ansible collection location = /home/ceseuron/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/bin/ansible-playbook
  python version = 3.12.3 (main, Feb  4 2025, 14:48:35) [GCC 13.3.0] (/usr/bin/python3)
  jinja version = 3.1.2
  libyaml = True
Using /home/ceseuron/Repos/prometheus-deploy/ansible/ansible.cfg as config file
setting up inventory plugins
Loading collection ansible.builtin from 
host_list declined parsing /home/ceseuron/Repos/prometheus-deploy/ansible/inventory/aws_ec2.yml as it did not pass its verify_file() method
script declined parsing /home/ceseuron/Repos/prometheus-deploy/ansible/inventory/aws_ec2.yml as it did not pass its verify_file() method
Loading collection amazon.aws from /home/ceseuron/.ansible/collections/ansible_collections/amazon/aws
Using inventory plugin 'ansible_collections.amazon.aws.plugins.inventory.aws_ec2' to process inventory source '/home/ceseuron/Repos/prometheus-deploy/ansible/inventory/aws_ec2.yml'
Parsed /home/ceseuron/Repos/prometheus-deploy/ansible/inventory/aws_ec2.yml inventory source with auto plugin
Loading collection prometheus.prometheus from /home/ceseuron/.ansible/collections/ansible_collections/prometheus/prometheus
ERROR! couldn't resolve module/action 'prometheus.prometheus.prometheus'. This often indicates a misspelling, missing collection, or incorrect module path.

The error appears to be in '/home/ceseuron/Repos/prometheus-deploy/ansible/prometheus.yml': line 41, column 7, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

  tasks:
    - name: Install Prometheus.
      ^ here

The Ansible play:

- name: Deploy Prometheus and Node Exporter.
  hosts: all
  gather_facts: no
  become: yes
  vars_files:
        - ./vars/default.yml
  vars:
    ansible_ssh_private_key: "{{ hostvars['localhost'].ssh_private_key }}"
    ansible_user: "ubuntu"
  tasks:
    - name: Install Prometheus.
      prometheus.prometheus.prometheus:
        name: prometheus
        version: "{{ prometheus_version }}"
        state: present
        install_dir: "{{ prometheus_install_dir }}"
        config_dir: "{{ prometheus_install_dir }}/config"
        service_state: started
        service_enabled: yes
    - name: Install Node Exporter.
      prometheus.prometheus.node_exporter:
        version:  "{{ prometheus_node_exporter_version }}"
        install_dir: "{{ prometheus_node_exporter_install_dir }}"

This error shouldn't be happening. Debug output clearly shows the collection is being loaded. I've verified, uninstalled, reinstalled, and re-verified the collection but I can't get Ansible to do anything other than complain about the same error.

Ansible version:

ansible [core 2.16.3]
  config file = /home/ceseuron/Repos/prometheus-deploy/ansible/ansible.cfg
  configured module search path = ['/home/ceseuron/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3/dist-packages/ansible
  ansible collection location = /home/ceseuron/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/bin/ansible
  python version = 3.12.3 (main, Feb  4 2025, 14:48:35) [GCC 13.3.0] (/usr/bin/python3)
  jinja version = 3.1.2
  libyaml = True

Output of ansible-galaxy collection list:

# /home/ceseuron/.ansible/collections/ansible_collections
Collection                               Version
---------------------------------------- -------
amazon.aws                               9.3.0  
prometheus.prometheus                    0.25.0 

[hong539]

Hey, dude:
From the prometheus.prometheus docs here
I think prometheus.prometheus.prometheus is a Role,
So you have to use the "Role" way to running your task!
Try the syntax for Roles here

For My simple example:

- name: Deploy Prometheus
  hosts: observability
  gather_facts: yes
  become: yes
  tasks:
    - name: Import a prometheus.prometheus.prometheus role
      ansible.builtin.import_role:
        name: prometheus.prometheus.prometheus
      vars:
        prometheus_version: "3.2.1"