diff --git a/defaults/main.yml b/defaults/main.yml
index 5b3a482..3a5fe17 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -270,6 +270,7 @@ prometheus_agent:
       for: 25h
       labels:
         severity: warning
+        instance: "{{ inventory_hostname }}"
       annotations:
         title: '{%raw%}{{ $labels.instance }}: AptUpgradesPending{%endraw%}'
         description: "Upgrades pending for more than 24 hours"