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Docs: mention ACM in Certificate Discovery #4112

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2 changes: 1 addition & 1 deletion docs/guide/ingress/cert_discovery.md
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# Certificate Discovery
TLS certificates for ALB Listeners can be automatically discovered with hostnames from Ingress resources if the [`spec.certificateArn`](ingress_class.md#speccertificatearn) in [`IngressClassParams`](ingress_class.md#ingressclassparams-specification) or [`alb.ingress.kubernetes.io/certificate-arn`](annotations.md#certificate-arn) annotation is not specified.

The controller will attempt to discover TLS certificates from the `tls` field in Ingress and `host` field in Ingress rules.
The controller will attempt to discover TLS certificates from ACM, based on the `tls` field in Ingress and `host` field in Ingress rules.

!!!note ""
You need to explicitly specify to use HTTPS listener with [listen-ports](annotations.md#listen-ports) annotation.
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