For CloudWatch metrics description please look here: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/viewing_metrics_with_cloudwatch.html

Labels:

Metric CloudWatch Metric Statistic Description
aws_ec2_instance_cpu_utilization CPUUtilization average
aws_ec2_cpu_credit_usage CPUCreditUsage average
aws_ec2_cpu_credit_balance CPUCreditBalance average
aws_ec2_cpu_surplus_credit_balance CPUSurplusCreditBalance average
aws_ec2_cpu_surplus_credits_charged CPUSurplusCreditsCharged average
aws_ec2_network_in NetworkIn average
aws_ec2_network_out NetworkOut average
aws_ec2_network_packets_in NetworkPacketsIn average
aws_ec2_network_packets_out NetworkPacketsOut average
aws_ec2_disk_read_bytes DiskReadBytes average
aws_ec2_disk_write_bytes DiskWriteBytes average
aws_ec2_disk_read_ops DiskReadOps average
aws_ec2_disk_write_ops DiskWriteOps average
aws_ec2_status_check_failed StatusCheckFailed average
aws_ec2_status_check_failed_instance StatusCheckFailed_Instance average
aws_ec2_status_check_failed_system StatusCheckFailed_System average
aws_ec2_disk_size_total sum Total size of attached EBS volumes
aws_ec2_memory_total sum Total amount of RAM
aws_ec2_cpu_idle average The percentage of allocated compute units that are currently idle