I'm probably missing something extremely obvious but I only see 6 metrics on my cloudwatch -- 4 EC2 (all about CPU Credits) and 2 for S3 (bucket size and # of objects). It feels like there should be ... you know more than 6 metrics? I really only have one EC2 instance on this account and it is currently stopped, but it runs every day for about half an hour. I should be able to see its metrics, right?
Was your stopped instance stopped over 3 hours ago? The CloudWatch console defaults to a 3 hour view. Change the time period by looking in the upper right for the text "1g 3h 12h 1d 3d 1w custom", and choose 1w. Expect to see at least the 9 metrics per instance that are documented at https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/ec2-metricscollected.html#ec2-metrics