changed the way rebooted servers info is gathered

Maintenance/maint-reboot-required.yaml

@@ -21,9 +21,14 @@
     
     - name: Add server to rebooted_servers list
       set_fact:
-        rebooted_servers: "{{ rebooted_servers | default([]) + [ansible_hostname] }}"
+        rebooted_servers: "{{ ansible_hostname }}"
       when: reboot.stat.exists
 
+    - name: Gather rebooted_servers list
+      set_fact:
+        rebooted_servers_all: "{{ hostvars|select('rebooted_servers is defined')|map(attribute='rebooted_servers')|list }}"
+      run_once: true
+
     - name: Debug rebooted servers
       debug:
         var: rebooted_servers
@@ -36,7 +41,7 @@
         body: |
           {
             "title": "Playbook: {{ ansible_play_name }}",
-            "text": "The following servers were rebooted: {{ rebooted_servers | join(', ') }}"
+            "text": "The following servers were rebooted: {{ rebooted_servers_all | join(', ') }}"
           }
         body_format: json
         headers: