Adjusted apt update to provide a feedback if upgrade is needed and wait one hour for cache update. Added localhost entity into the hosts.ini

inventory/example_hosts.ini

@@ -18,7 +18,7 @@ raspberry-pi ansible_host=x.x.x.x
 [lxc]
 ansible ansible_host=x.x.x.x
 zabbix-proxy ansible_host=x.x.x.x
-pi-hole ansible_host=x.x.x.x
+localhost ansible_connection=local # for testing playbooks on the control node
 
 [proxmox_backup]
 proxmox-backup ansible_host=x.x.x.x

playbooks/apt_upgrade.yml

@@ -1,14 +1,23 @@
-- name: Upgrade packages
+---
+- name: Upgrade all apt packages
   hosts: ubuntu
-  become: true
-
+  become: yes
   tasks:
-   - name: Update cache 
-     ansible.builtin.apt:
-      update_cache: true
-     register: cache_updated
+    - name: Update apt cache
+      ansible.builtin.apt:
+        update_cache: yes
+        cache_valid_time: 3600
 
-   - name: Upgrade packages if something is changed
-     ansible.builtin.apt:
-      upgrade: "yes"
-     when: cache_updated.changed
+    - name: Upgrade all apt packages
+      ansible.builtin.apt:
+        upgrade: dist
+
+    - name: Check if a reboot is required
+      ansible.builtin.stat:
+        path: /var/run/reboot-required
+      register: reboot_required_file
+
+    - name: Display reboot message
+      ansible.builtin.debug:
+        msg: "A reboot is required to apply the latest updates."
+      when: reboot_required_file.stat.exists