junos_serial.yml

---
  - name: Get Device Facts
    hosts: all-devices
    roles:
     - Juniper.junos 
    connection: local
    gather_facts: no

    tasks:
     - name: Checking NETCONF connectivity
       wait_for: host={{ inventory_hostname }} port=830 timeout=5

     - name: Retrieve information from devices running Junos OS
       junos_get_facts:  
         host={{ inventory_hostname }}
       register: junos

     - name: serial
       debug: msg="{{ junos.facts.serialnumber }}"