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How would I set the health check params on a LB defined like:
```
let fibLB = infra.x.ecs.LoadBalancer.fromPortInfo("fib-fargate-lb", {
    cluster: cluster,
    port: 80,
    targetPort: 8080,
    external: true,
    protocol: "http"
});
```

The health check needs to be set on the target group, not the LB :thinking_face:

I tried doing this
```
let fibTG = new aws.elasticloadbalancingv2.TargetGroup("fib-tg", {
    protocol: "HTTP",
    port: 8080,
    vpcId: network.vpcId,
    healthCheck: {
        healthyThreshold: 2,
        unhealthyThreshold: 10,
        timeout: 5,
        interval: 300
    }
});

let fibLB2 = infra.x.ecs.LoadBalancer.fromTargetGroupInfo("fib-fargate-lb", {
    targetGroupArn: fibTG.arn,
    hostPort: 80,
    containerPort: 8080
});
```
But `targetGroupArn` cannot be a `Output&lt;string&gt;`. Using `fromTargetGroupInfo` doesn't let you specify a cluster. Is that ok?

<@UB9JVTW07> This seems like something that could be supported by `fromPortInfo`.

<https://github.com/pulumi/pulumi-aws-infra/pull/69>

but the existing infra.x.ecs.LoadBalancer is going away

it was a temporary measure to get Service/TaskDef off the ground