Why some pods's metrics are not collected by adot

I followed the instruction in https://aws.amazon.com/blogs/containers/introducing-amazon-cloudwatch-container-insights-for-amazon-eks-fargate-using-aws-distro-for-opentelemetry/ to collect metrics of cpu and memory of pods deployed as fargate. I am able to see metrics of some pods. But metrics of those most important pods are missing. I checked their performance log events are there, but without embedded metrics. I guess maybe something in our code preventing the metrics to be collected. Any help will be appreciated. Thanks in advance