ansible/roles/node_exporter/tasks/get_version.yml

---
- name: Determine latest GitHub release (local)
  delegate_to: localhost
  uri:
    url: "https://api.github.com/repos/prometheus/node_exporter/releases/{{ version }}"
    body_format: json
  register: _github_release
  until: _github_release.status == 200
  retries: 3

- name: Set version
  set_fact:
    version: "{{ _github_release.json.tag_name
      | regex_replace('^v?([0-9\\.]+)$', '\\1') }}"

- name: Set download_url
  set_fact:
    download_url: "https://github.com/prometheus/node_exporter/releases/download/v{{ version }}/node_exporter-{{ version }}.linux-{{ go_arch }}.tar.gz"