diff --git a/CHANGELOG.md b/CHANGELOG.md
index b8fddc84..c1f94aad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## master / unreleased
 
+* [FEATURE] Add trafficDistribution attribute to services #674
+
 ## 3.4.0 / 2026-09-21
 
 * [FEATURE] Add remote-write OTLP endpoint in nginx #667
diff --git a/README.md b/README.md
index 53243545..a68cb5e8 100644
--- a/README.md
+++ b/README.md
@@ -129,6 +129,7 @@ Kubernetes: `^1.19.0-0`
 | alertmanager.​securityContext | object | `{}` |  |
 | alertmanager.​service.​annotations | object | `{}` |  |
 | alertmanager.​service.​labels | object | `{}` |  |
+| alertmanager.​service.​trafficDistribution | string | `""` |  |
 | alertmanager.​serviceAccount.​name | string | `""` | "" disables the individual serviceAccount and uses the global serviceAccount for that component |
 | alertmanager.​serviceMonitor.​additionalLabels | object | `{}` |  |
 | alertmanager.​serviceMonitor.​enabled | bool | `false` |  |
@@ -299,6 +300,7 @@ Kubernetes: `^1.19.0-0`
 | distributor.​securityContext | object | `{}` |  |
 | distributor.​service.​annotations | object | `{}` |  |
 | distributor.​service.​labels | object | `{}` |  |
+| distributor.​service.​trafficDistribution | string | `""` |  |
 | distributor.​serviceAccount.​name | string | `""` | "" disables the individual serviceAccount and uses the global serviceAccount for that component |
 | distributor.​serviceMonitor.​additionalLabels | object | `{}` |  |
 | distributor.​serviceMonitor.​enabled | bool | `false` |  |
@@ -746,6 +748,7 @@ Kubernetes: `^1.19.0-0`
 | query_frontend.​securityContext | object | `{}` |  |
 | query_frontend.​service.​annotations | object | `{}` |  |
 | query_frontend.​service.​labels | object | `{}` |  |
+| query_frontend.​service.​trafficDistribution | string | `""` |  |
 | query_frontend.​serviceAccount.​name | string | `""` | "" disables the individual serviceAccount and uses the global serviceAccount for that component |
 | query_frontend.​serviceMonitor.​additionalLabels | object | `{}` |  |
 | query_frontend.​serviceMonitor.​enabled | bool | `false` |  |
@@ -844,6 +847,7 @@ Kubernetes: `^1.19.0-0`
 | ruler.​securityContext | object | `{}` |  |
 | ruler.​service.​annotations | object | `{}` |  |
 | ruler.​service.​labels | object | `{}` |  |
+| ruler.​service.​trafficDistribution | string | `""` |  |
 | ruler.​serviceAccount.​name | string | `""` | "" disables the individual serviceAccount and uses the global serviceAccount for that component |
 | ruler.​serviceMonitor.​additionalLabels | object | `{}` |  |
 | ruler.​serviceMonitor.​enabled | bool | `false` |  |
diff --git a/templates/alertmanager/alertmanager-svc.yaml b/templates/alertmanager/alertmanager-svc.yaml
index 35f4cc33..5ba60356 100644
--- a/templates/alertmanager/alertmanager-svc.yaml
+++ b/templates/alertmanager/alertmanager-svc.yaml
@@ -20,4 +20,7 @@ spec:
       targetPort: http-metrics
   selector:
     {{- include "cortex.alertmanagerSelectorLabels" . | nindent 4 }}
+  {{- with .Values.alertmanager.service.trafficDistribution }}
+  trafficDistribution: {{ . }}
+  {{- end }}
 {{- end -}}
diff --git a/templates/distributor/distributor-svc.yaml b/templates/distributor/distributor-svc.yaml
index 451740ac..b0a36eb0 100644
--- a/templates/distributor/distributor-svc.yaml
+++ b/templates/distributor/distributor-svc.yaml
@@ -20,4 +20,7 @@ spec:
       targetPort: http-metrics
   selector:
     {{- include "cortex.distributorSelectorLabels" . | nindent 4 }}
-{{- end }}
\ No newline at end of file
+  {{- with .Values.distributor.service.trafficDistribution }}
+  trafficDistribution: {{ . }}
+  {{- end }}
+{{- end }}
diff --git a/templates/nginx/nginx-svc.yaml b/templates/nginx/nginx-svc.yaml
index a7b00327..801faf91 100644
--- a/templates/nginx/nginx-svc.yaml
+++ b/templates/nginx/nginx-svc.yaml
@@ -20,4 +20,7 @@ spec:
       targetPort: http-metrics
   selector:
     {{- include "cortex.nginxSelectorLabels" . | nindent 4 }}
+  {{- with .Values.nginx.service.trafficDistribution }}
+  trafficDistribution: {{ . }}
+  {{- end }}
 {{- end }}
diff --git a/templates/query-frontend/query-frontend-svc.yaml b/templates/query-frontend/query-frontend-svc.yaml
index 9f0c8f1b..5c138ed2 100644
--- a/templates/query-frontend/query-frontend-svc.yaml
+++ b/templates/query-frontend/query-frontend-svc.yaml
@@ -24,4 +24,7 @@ spec:
       targetPort: grpc
   selector:
     {{- include "cortex.queryFrontendSelectorLabels" . | nindent 4 }}
+  {{- with .Values.query_frontend.service.trafficDistribution }}
+  trafficDistribution: {{ . }}
+  {{- end }}
 {{- end -}}
diff --git a/templates/ruler/ruler-svc.yaml b/templates/ruler/ruler-svc.yaml
index 7752ef42..79df3ff9 100644
--- a/templates/ruler/ruler-svc.yaml
+++ b/templates/ruler/ruler-svc.yaml
@@ -20,4 +20,7 @@ spec:
       targetPort: http-metrics
   selector:
     {{- include "cortex.rulerSelectorLabels" . | nindent 4 }}
+  {{- with .Values.ruler.service.trafficDistribution }}
+  trafficDistribution: {{ . }}
+  {{- end }}
 {{- end }}
diff --git a/values.yaml b/values.yaml
index 39611289..10afadd8 100644
--- a/values.yaml
+++ b/values.yaml
@@ -155,6 +155,7 @@ alertmanager:
   service:
     annotations: {}
     labels: {}
+    trafficDistribution: ""
 
   serviceAccount:
     # -- "" disables the individual serviceAccount and uses the global serviceAccount for that component
@@ -337,6 +338,7 @@ distributor:
   service:
     annotations: {}
     labels: {}
+    trafficDistribution: ""
 
   serviceAccount:
     # -- "" disables the individual serviceAccount and uses the global serviceAccount for that component
@@ -636,6 +638,7 @@ ruler:
   service:
     annotations: {}
     labels: {}
+    trafficDistribution: ""
 
   serviceAccount:
     # -- "" disables the individual serviceAccount and uses the global serviceAccount for that component
@@ -897,6 +900,7 @@ query_frontend:
   service:
     annotations: {}
     labels: {}
+    trafficDistribution: ""
 
   serviceAccount:
     # -- "" disables the individual serviceAccount and uses the global serviceAccount for that component