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This should probably be a priority, #209 introduced a regression that breaks support for extra groups. As a result, alloy is unable to extract certain logs at the same time, such as those from docker and some of /var/log, which require groups docker and adm respectively.

This doesn't work...

    "msg": "Group ['alloy', 'adm', 'docker'] does not exist"

It has to be something like

- name: Create alloy user
  ansible.builtin.user:
    name: "{{ alloy_service_user }}"
    group: "{{ alloy_service_group }}"
    groups: "{{ alloy_user_groups | join(',') }}"
    system: true
    create_home: false  # Appropriate for a system user, usually doesn't need a home directory
  become: true

you can't pass a list of groups into the group: input. It needs to go into groups: