I have an Application Load Balancer whose data transfer cost I want to monitor.
In Cost Explorer, I can filter on usage type "DataTransfer-Out-Bytes", and see how many GB of data it is sending, and how much that costs. I'd like to see that same number in CloudWatch metrics, but I can't find any corresponding metric. The Per-AppELB "ProcessedBytes" metric sounded promising, but that number is slightly more than half the number I see in Cost Explorer. (My best guess is that TLS handshake overhead isn't included.)
Is there any metric or combination of metrics that matches what I end up getting billed for?