diff --git a/argocd/applications/configs/alerting-monitor.yaml b/argocd/applications/configs/alerting-monitor.yaml
index 57bb2620b..83459c1ac 100644
--- a/argocd/applications/configs/alerting-monitor.yaml
+++ b/argocd/applications/configs/alerting-monitor.yaml
@@ -5,6 +5,9 @@
 caSecretName: gateway-ca-cert
 caSecretKey: ca.crt
 
+initialRules:
+  hostAggregationWindowSeconds: 240
+
 openPolicyAgent:
   image:
     tag: 1.10.1-static