change rebooted server list

Maintenance/maint-reboot-required.yaml

@@ -19,14 +19,9 @@
         delay: 5
         timeout: 300
     
-    - name: Get list of rebooted servers
-      set_fact:
-        rebooted_servers: []
-      when: not rebooted_servers.exists
-
     - name: Add server to rebooted_servers list
       set_fact:
-        rebooted_servers: "{{ rebooted_servers + [ansible_host] }}"
+        rebooted_servers: "{{ rebooted_servers | default([]) + [ansible_hostname] }}"
       when: reboot.stat.exists
 
     - name: Debug rebooted servers