label foo: bar # Add the existing custom selector label ``` #### Migrating an existing Helm release An existing helm release can be `helm upgrade`d to this chart by using the same release name. For example, if a previous installation was done like: ```console helm install istio-ingress manifests/charts/gateways/istio-ingress -n istio-system ``` It could be upgraded with ```console helm upgrade istio-ingress manifests/charts/gateway -n istio-system --set name=istio-ingressgateway --set labels.app=istio-ingressgateway...