Kubelet can't get pod data of the metrics by interface

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I search for kubelet metrics by curl tools to send request, And then can receive json data from kubelet. but one of the pod field of value is empty, Another the node field is ok.

https://xxxx:10250/stats/summary?only_cpu_and_memory=true

Cluster information:

Kubernetes version: v1.18.20
Cloud being used: (put bare-metal if not on a public cloud)
Installation method: kubeadm init
Host OS: Centos 7.9 5.4.210-1.el7.elrepo.x86_64
CNI and version: v0.3.1
CRI and version: Docker-ce v20.10.17

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