I use Metricbeat (v7.9.2) to send CPU and memory metrics of the pods to ES. When I navigate to the page Observability>Metrics and select Docker Container, I see the container of my Pod with a CPU usage of 53.3% and a memory usage of 78.6%. If I changed my selection to Kubernets Pod, I see a CPU usage of 0.8% and a memory usage of 0.6%. Unfortunately I did not find any hint in the documentation.
I don't know if it matters, but we use Kibana version 7.8.1.