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docs: add SubnetDiscoveryByReachability feature gate to values.yaml and feature-gates table #4331

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docs: add SubnetDiscoveryByReachability feature gate to values.yaml and feature-gates table #4331

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docs: add SubnetDiscoveryByReachability feature gate to values.yaml a…
nghiadaulau Sep 4, 2025
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Merge branch 'main' into main
nghiadaulau Sep 27, 2025
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1 change: 1 addition & 0 deletions docs/deploy/configurations.md
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Expand Up @@ -188,3 +188,4 @@ There are a set of key=value pairs that describe AWS load balancer controller fe
| LBCapacityReservation | string | true | Enable or disable the capacity reservation feature on ALB and NLB |
| EnableTCPUDPListenerType | string | false | Enable or disable creation of TCP_UDP type listeners. This value can be overriden at the Service level by the annotation `service.beta.kubernetes.io/aws-load-balancer-enable-tcp-udp-listener` |
| EnhancedDefaultBehavior | string | false | Enable this feature to allow the controller to remove Provisioned Capacity or mTLS settings by removing the corresponding annotation. |
| SubnetDiscoveryByReachability | string | true | Automatically discover all subnets in the VPC and classify them as public/private based on route table configuration (route to Internet Gateway → public, route via NAT/TGW/VPC endpoint → private). Can be disabled with this flag. |
1 change: 1 addition & 0 deletions helm/aws-load-balancer-controller/values.yaml
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Expand Up @@ -375,6 +375,7 @@ controllerConfig:
# NLBHealthCheckAdvancedConfig: true
# ALBSingleSubnet: false
# LBCapacityReservation: true
# SubnetDiscoveryByReachability: true # auto-discover subnet public/private via route tables
# EnhancedDefaultBehavior: false

certDiscovery:
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