gistfile1.txt

---
- name: Stop all running logspout containers
  shell: "docker ps | sed -e '1d' | grep logspout | awk {'print $1'} | xargs docker stop || :"
  ignore_errors: yes
  when: force_pull

- name: delete all Logspout containers
  shell: "docker ps -a | grep logspout | awk '{print $1}' | xargs docker rm -f || :"
  ignore_errors: yes
  when: force_pull

- name: Clean all Logspout images
  shell: "docker images | sed -e '1d' | grep logspout | awk {'print $3'} | xargs docker rmi -f || :"
  when: force_pull

- name: Remove old image
  shell: docker rmi -f {{ docker_image }}
  ignore_errors: yes
  when: force_pull

- name: Pull new image
  shell: docker pull {{ docker_image }}
  ignore_errors: yes
  when: force_pull

- name: Remove old container gracefully
  docker:
    image: "{{ docker_image }}"
    state: absent
  when: restart_logspout

- name: Start Logspout Container
  docker:
    state: running
    name: "{{ container_name }}"
    image: "{{ docker_image }}"
    registry: https://index.docker.io/v1/
    command: syslog://{{ papertrail_url }}
    hostname: "{{ ansible_fqdn }}"
    volumes:
      - '/var/run/docker.sock:/tmp/docker.sock'

Where is "restart_logspout" defined, or how is it defined? Another part of playbook?