Elastic Load Balancer (ELB) - Amazon CloudWatch
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Elastic Load Balancer (ELB)

CloudWatch Application Insights supports the following metrics:

EstimatedALBActiveConnectionCount

EstimatedALBConsumedLCUs

EstimatedALBNewConnectionCount

EstimatedProcessedBytes

HTTPCode_Backend_4XX

HTTPCode_Backend_5XX

HealthyHostCount

RequestCount

UnHealthyHostCount