---

- name: Install apt key
  apt_key:
    url: https://repos.influxdata.com/influxdb.key
    state: present

- name: Install apt-repo
  apt_repository:
    repo: 'deb https://repos.influxdata.com/{{ ansible_distribution | lower }} {{ ansible_distribution_release }} stable'
    state: present

- name: Install influxdb
  apt:
    name: influxdb
    state: present

- name: Adjust configuration
  replace:
    dest: /etc/influxdb/influxdb.conf
    regexp: '(# |){{ item.key }} = .*'
    replace: '{{ item.key }} = {{ item.value }}'
  with_dict: '{{ influxdb_config }}'
  register: influxdb_config_replace

- name: Ensure influxdb is enabled
  systemd:
    name: influxdb.service
    enabled: true

- name: Ensure influxdb is restarted
  systemd:
    name: influxdb.service
    state: restarted
  when: influxdb_config_replace.changed

...