configure feature gates with helm chart

Author: khizunov

helm/aws-load-balancer-controller/README.md

@@ -163,7 +163,7 @@ Chart release v1.2.0 and later enables high availability configuration by defaul
 ## Configuration
 
 The following tables lists the configurable parameters of the chart and their default values.
-The default values set by the application itself can be confirmed [here](https://kubernetes-sigs.github.io/aws-load-balancer-controller/guide/controller/configurations/).
+The default values set by the application itself can be confirmed [here](https://kubernetes-sigs.github.io/aws-load-balancer-controller/v2.4/deploy/configurations/#controller-configuration-options).
 
 | Parameter                                      | Description                                                                                              | Default                                                                            |
 |------------------------------------------------| -------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------- |
@@ -245,3 +245,4 @@ The default values set by the application itself can be confirmed [here](https:/
 | `serviceMonitor.interval`                      | Prometheus scrape interval                                                                               | `1m`                                                                               |
 | `serviceMonitor.namespace`                     | Namespace in which Prometheus is running                                                                 | None                                                                               |
 | `clusterSecretsPermissions.allowAllSecrets`    | If `true`, controller has access to all secrets in the cluster.                                          | `false`                                                                            |
+| `controllerConfig.featureGates`                | set of `key: value` pairs that describe AWS load balance controller features                             | `{}`                                                                               |

helm/aws-load-balancer-controller/templates/deployment.yaml

@@ -143,6 +143,9 @@ spec:
         {{- if kindIs "bool" .Values.disableRestrictedSecurityGroupRules }}
         - --disable-restricted-sg-rules={{ .Values.disableRestrictedSecurityGroupRules }}
         {{- end }}
+        {{- if .Values.controllerConfig.featureGates }}
+        - --feature-gates={{ include "aws-load-balancer-controller.convertMapToCsv" .Values.controllerConfig.featureGates | trimSuffix "," }}
+        {{- end }}
         {{- if .Values.env }}
         env:
         {{- range $key, $value := .Values.env }}

helm/aws-load-balancer-controller/values.yaml

@@ -284,6 +284,13 @@ backendSecurityGroup:
 # disableRestrictedSecurityGroupRules specifies whether to disable creating port-range restricted security group rules for traffic
 disableRestrictedSecurityGroupRules:
 
+# controllerConfig specifies controller configuration
+controllerConfig:
+  # featureGates set of key: value pairs that describe AWS load balance controller features
+  featureGates: {}
+  #  ServiceTypeLoadBalancerOnly: true
+  #  EndpointsFailOpen: true
+
 # objectSelector for webhook
 objectSelector:
   matchExpressions: