update docker count

Author: Mafyuh

ansible/playbooks/docker-count.yml

@@ -1,7 +1,7 @@
 ---
 - name: Count Docker containers on all hosts
   hosts: all
-  gather_facts: no
+  gather_facts: false
   tasks:
     - name: Count running Docker containers on each host
       shell: "docker ps -q | wc -l"
@@ -12,10 +12,16 @@
       debug:
         msg: "Host {{ inventory_hostname }} has {{ container_count.stdout }} running Docker containers"
 
-    - name: Aggregate total count
-      run_once: true
-      delegate_to: localhost
-      vars:
-        container_counts: "{{ hostvars | map(attribute='container_count.stdout') | map('int') | list }}"
+- name: Aggregate total count
+  hosts: localhost
+  gather_facts: false
+  tasks:
+    - name: Collect container counts from all hosts
+      set_fact:
+        container_counts: >-
+          {{ hostvars | dict2items | selectattr('value.container_count', 'defined') |
+          map(attribute='value.container_count.stdout') | map('int') | list }}
+
+    - name: Display total running Docker containers
       debug:
         msg: "Total running Docker containers across all hosts: {{ container_counts | sum }}"