Description of problem:
Login cluster console with cluster admin, click "Workloads -> Pods", and select one project from drop-down list, eg: openshift-kube-apiserver,
then select one pod, in the "Pod Overview" section, the "Memory Usage" uses 
"pod_name:container_memory_usage_bytes:sum{pod_name='kube-apiserver-ip-10-0-139-94.us-east-2.compute.internal',namespace='openshift-kube-apiserver'}" to calculate "Memory Usage"

search in prometheus UI
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pod_name:container_memory_usage_bytes:sum{pod_name='kube-apiserver-ip-10-0-139-94.us-east-2.compute.internal',namespace='openshift-kube-apiserver'} / 1024 /1024

Element	Value
{namespace="openshift-kube-apiserver",pod_name="kube-apiserver-ip-10-0-139-94.us-east-2.compute.internal"}	1833.5234375
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whereas
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# oc -n openshift-kube-apiserver adm top pod kube-apiserver-ip-10-0-139-94.us-east-2.compute.internal
NAME                                                       CPU(cores)   MEMORY(bytes)   
kube-apiserver-ip-10-0-139-94.us-east-2.compute.internal   206m         867Mi  
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Although we know `oc -n openshift-kube-apiserver adm top pod kube-apiserver-ip-10-0-139-94.us-east-2.compute.internal` uses the following expression
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sum(container_memory_working_set_bytes{container_name!="POD",container_name!="",pod_name!="", pod_name="kube-apiserver-ip-10-0-139-94.us-east-2.compute.internal"}) / 1024 /1024
Element	Value
{}	867.28515625
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I think "Memory Usage" under "Workloads -> Pods" should be the same with "oc adm top pod"

Version-Release number of selected component (if applicable):
4.1.0-0.nightly-2019-05-18-050636

How reproducible:
Always

Steps to Reproduce:
1. See the description part
2.
3.

Actual results:
"Memory Usage" under "Workloads -> Pods" is not the same with "oc adm top pod"

Expected results:
"Memory Usage" under "Workloads -> Pods" should be the same with "oc adm top pod"

Additional info: