diff --git a/hosting/k8s/helm/templates/_helpers.tpl b/hosting/k8s/helm/templates/_helpers.tpl
index 26d3bd1bf..74ce765cb 100644
--- a/hosting/k8s/helm/templates/_helpers.tpl
+++ b/hosting/k8s/helm/templates/_helpers.tpl
@@ -234,3 +234,21 @@ Generate docker config for image pull secret
 {{- end }}
 {{- end }}
 
+{{/*
+Merge ingress annotations to avoid duplicates
+*/}}
+{{- define "trigger-v4.ingress.annotations" -}}
+{{- $annotations := dict -}}
+{{- if .Values.ingress.annotations -}}
+{{- $annotations = .Values.ingress.annotations -}}
+{{- end -}}
+{{- if .Values.ingress.certManager.enabled -}}
+{{- $_ := set $annotations "cert-manager.io/cluster-issuer" .Values.ingress.certManager.clusterIssuer -}}
+{{- end -}}
+{{- if .Values.ingress.externalDns.enabled -}}
+{{- $_ := set $annotations "external-dns.alpha.kubernetes.io/hostname" .Values.ingress.externalDns.hostname -}}
+{{- $_ := set $annotations "external-dns.alpha.kubernetes.io/ttl" (.Values.ingress.externalDns.ttl | toString) -}}
+{{- end -}}
+{{- toYaml $annotations -}}
+{{- end }}
+
diff --git a/hosting/k8s/helm/templates/ingress.yaml b/hosting/k8s/helm/templates/ingress.yaml
index 8227f15ad..ba9640b9f 100644
--- a/hosting/k8s/helm/templates/ingress.yaml
+++ b/hosting/k8s/helm/templates/ingress.yaml
@@ -8,16 +8,7 @@ metadata:
   labels:
     {{- include "trigger-v4.labels" . | nindent 4 }}
   annotations:
-    {{- with .Values.ingress.annotations }}
-    {{- toYaml . | nindent 4 }}
-    {{- end }}
-    {{- if .Values.ingress.certManager.enabled }}
-    cert-manager.io/cluster-issuer: {{ .Values.ingress.certManager.clusterIssuer | quote }}
-    {{- end }}
-    {{- if .Values.ingress.externalDns.enabled }}
-    external-dns.alpha.kubernetes.io/hostname: {{ .Values.ingress.externalDns.hostname | quote }}
-    external-dns.alpha.kubernetes.io/ttl: {{ .Values.ingress.externalDns.ttl | quote }}
-    {{- end }}
+    {{- include "trigger-v4.ingress.annotations" . | nindent 4 }}
 spec:
   {{- if .Values.ingress.className }}
   ingressClassName: {{ .Values.ingress.className }}
diff --git a/hosting/k8s/helm/values.yaml b/hosting/k8s/helm/values.yaml
index b9ca9f495..8a62c4b7d 100644
--- a/hosting/k8s/helm/values.yaml
+++ b/hosting/k8s/helm/values.yaml
@@ -548,6 +548,11 @@ persistence:
 ingress:
   enabled: false
   className: "traefik"
+  # Custom annotations for the ingress resource
+  # Note: The following annotation keys are reserved and will be automatically set:
+  # - cert-manager.io/cluster-issuer (when certManager.enabled is true)
+  # - external-dns.alpha.kubernetes.io/hostname (when externalDns.enabled is true)
+  # - external-dns.alpha.kubernetes.io/ttl (when externalDns.enabled is true)
   annotations: {}
   certManager:
     enabled: false