Undefined variable when calling node_exporter role

[ansiblejunky]

Calling the role with the following task:

    - name: Install node exporter
      ansible.builtin.include_role:
        name: prometheus.prometheus.node_exporter

Ansible produces:

    "msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'system'. 'dict object' has no attribute 'system'. 'dict object' has no attribute 'system'. 'dict object' has no attribute 'system'"

Using ansible [core 2.16.5]
Using collection prometheus.prometheus = 0.26.1

[gardar]

Do you by any chance have facts gathering disabled?

[ansiblejunky]

Correct it's disabled

[gardar]

That's most likely the issue then, the roles all rely on Ansible facts to some degree.

[ansiblejunky]

Is that documented somewhere? Cuz that wasn't clear to me as a pre-req.

[gardar]

Is that documented somewhere? Cuz that wasn't clear to me as a pre-req.

Yes and no, perhaps not clearly enough.
You can see in the docs that some of the default values rely on fact values such as https://prometheus-community.github.io/ansible/branch/main/node_exporter_role.html#parameter-main--node_exporter_local_cache_path

But it's not enough to replace them as there are other instances where the roles rely on the facts, for example for the systemd version, if selinux is enabled, etc.