Suggested Answer:A🗳️
AWS Auto Scaling supports both detailed as well as basic monitoring of the CloudWatch metrics. Basic monitoring happens every 5 minutes, while detailed monitoring happens every minute. It sup-ports 8 metrics and 1 dimension. The metrics are:
GroupMinSize -
GroupMaxSize -
GroupDesiredCapacity -
GroupInServiceInstances -
GroupPendingInstances -
GroupStandbyInstances -
GroupTerminatingInstances -
GroupTotalInstances - The dimension is AutoScalingGroupName Reference: http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/supported_services.html
CloudWatch supports a total of 8 metrics specifically for Auto Scaling. These metrics help monitor and manage the performance and behavior of Auto Scaling groups.
The ELB can determine that an instance is unhealthy. But on an ASG you have a choice of using simple EC2 health checks or combined ELB/EC2 health checks. If you choose the former, an ELB determination of unhealthy is ignored.
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