Fix prometheus fix

Part of [0] was incorrect, revert that.

[0] I1dc5baa8d0da2a454eaa4459e87fc22a275698df

Signed-off-by: Dr. Jens Harbott <[email protected]>
Change-Id: I67479cf1f59bb70ce352fe93d38b16347c6a678e
(cherry picked from commit fb3aa1b)

Author: osfrickler

ansible/roles/prometheus/tasks/config.yml

@@ -48,7 +48,7 @@
     dest: "{{ node_config_directory }}/prometheus-server/{{ item.path | basename }}"
     mode: "0660"
   when:
-    - inventory_hostname in groups.get(item.value.group, [])
+    - inventory_hostname in groups[service.group]
     - service.enabled | bool and enable_prometheus_alertmanager | bool
     - prometheus_alert_rules is defined and prometheus_alert_rules.files | length > 0
   with_items: "{{ prometheus_alert_rules.files }}"