add missing var to arg spec

meta/argument_specs.yml

@@ -102,6 +102,11 @@ argument_specs:
         type: str
         required: true
         description: Icinga master node fully qualified hostname.
+      icinga_master_nodes:
+        type: list
+        elements: str
+        required: true
+        description: A list of Icinga master nodes, there shoudl only be one.
       icinga_master_node_ipv4:
         type: str
         required: true

tasks/main.yml

@@ -18,6 +18,11 @@
 - name: Icinga agent node group and debugging and checking
   block:
 
+    - name: Debug icinga_master_nodes
+      ansible.builtin.debug:
+        var: icinga_master_nodes
+        verbosity: "{% if ansible_check_mode | bool %}0{% else %}1{% endif %}"
+
     - name: Include Icinga verify variables tasks
       ansible.builtin.include_tasks: verify.yml
       when: