diff --git a/charts/prometheus/Chart.yaml b/charts/prometheus/Chart.yaml
index 8c8f7d21a886..62517cbf74a5 100644
--- a/charts/prometheus/Chart.yaml
+++ b/charts/prometheus/Chart.yaml
@@ -1,7 +1,7 @@
 apiVersion: v2
 name: prometheus
 appVersion: v3.1.0
-version: 27.1.0
+version: 27.2.0
 kubeVersion: ">=1.19.0-0"
 description: Prometheus is a monitoring system and time series database.
 home: https://prometheus.io/
diff --git a/charts/prometheus/templates/service.yaml b/charts/prometheus/templates/service.yaml
index 069f3270d813..641a7dec371f 100644
--- a/charts/prometheus/templates/service.yaml
+++ b/charts/prometheus/templates/service.yaml
@@ -29,6 +29,9 @@ spec:
   {{- range $cidr := .Values.server.service.loadBalancerSourceRanges }}
     - {{ $cidr }}
   {{- end }}
+{{- end }}
+{{- if ne .Values.server.service.type "ClusterIP" }}
+  externalTrafficPolicy: {{ .Values.server.service.externalTrafficPolicy }}
 {{- end }}
   ports:
     - name: http
diff --git a/charts/prometheus/values.yaml b/charts/prometheus/values.yaml
index e0be6ceb9af0..982ed142d63a 100644
--- a/charts/prometheus/values.yaml
+++ b/charts/prometheus/values.yaml
@@ -724,6 +724,7 @@ server:
     servicePort: 80
     sessionAffinity: None
     type: ClusterIP
+    externalTrafficPolicy: ""
 
     ## Enable gRPC port on service to allow auto discovery with thanos-querier
     gRPC: