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docs: ingress subnets annotation - clarify locale differences #3579

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Feb 19, 2024
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docs: ingress subnets annotation - clarify locale differences #3579

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5 changes: 4 additions & 1 deletion docs/guide/ingress/annotations.md
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Expand Up @@ -226,7 +226,10 @@ Traffic Routing can be controlled with following annotations:
- <a name="subnets">`alb.ingress.kubernetes.io/subnets`</a> specifies the [Availability Zone](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html)s that the ALB will route traffic to. See [Load Balancer subnets](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-subnets.html) for more details.

!!!note ""
You must specify at least two subnets in different AZs. Either subnetID or subnetName(Name tag on subnets) can be used.
You must specify at least two subnets in different AZs unless utilizing the outpost locale, in which case a single subnet suffices. Either subnetID or subnetName(Name tag on subnets) can be used.

!!!note ""
You must not mix subnets from different locales: availability-zone, local-zone, wavelength-zone, outpost.

!!!tip
You can enable subnet auto discovery to avoid specifying this annotation on every Ingress. See [Subnet Discovery](../../deploy/subnet_discovery.md) for instructions.
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