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Hello.
You can check the number of target instances that failed the health check by looking at things like "UnHealthyHostCount," but I don't think you can check the cause of the failure.
Therefore, I think it is difficult to identify the cause of past health check failures from CloudWatch metrics.
https://docs.aws.amazon.com/elasticloadbalancing/latest/network/load-balancer-cloudwatch-metrics.html
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