okd/roles/openshift_logging/tasks/label_node.yaml

---
- command: >
    {{ openshift.common.client_binary }} --config={{ mktemp.stdout }}/admin.kubeconfig get node {{host}}
    -o jsonpath='{.metadata.labels.{{ label }}}'
  register: label_value
  failed_when: label_value.rc == 1 and 'exists' not in label_value.stderr
  when: not ansible_check_mode
  changed_when: no

- command: >
    {{ openshift.common.client_binary }} --config={{ mktemp.stdout }}/admin.kubeconfig label node {{host}} {{label}}={{value}} --overwrite
  register: label_result
  failed_when: label_result.rc == 1 and 'exists' not in label_result.stderr
  when:
  - value is defined
  - label_value.stdout is defined
  - label_value.stdout != value
  - unlabel is not defined or not unlabel
  - not ansible_check_mode

- command: >
    {{ openshift.common.client_binary }} --config={{ mktemp.stdout }}/admin.kubeconfig label node {{host}} {{label}}-
  register: label_result
  failed_when: label_result.rc == 1 and 'exists' not in label_result.stderr
  when:
  - unlabel is defined
  - unlabel
  - not ansible_check_mode
  - label_value.stdout != ""