Stateful counting mechanism

counter.yml

---
- name: Sequential
  hosts: localhost
  connection: local
  vars:
    basename: launch_config_
  tasks:
  - block:
    - include_vars: config_counter.yml

    - name: Set counter
      set_fact:
        count: "{{ last_num|int + 1 }}"

    - name: Set new name
      set_fact:
        gen_name: "{{ basename + count }}" 

    - name: Template vars for future run
      template:
        src: config_counter.yml.j2
        dest: ./config_counter.yml

    rescue:
    - name: Set first name
      set_fact:
        gen_name: "{{ basename + '1' }}"
        count: 1

    - name: Template vars for future run
      template:
        src: config_counter.yml.j2
        dest: ./config_counter.yml

    always:
    - name: Dbug
      debug:
        msg: "{{ gen_name }}"