To check the pods that use most memory and CPU, you can use the kubectl top command, but it doesn't sort the pods on basis of highest usage. You can only see the current usage of pods.
$ kubectl top pod --all-namespaces
NAMESPACE NAME CPU(cores) MEMORY(bytes)
kube-system kube-proxy-gke-rel3170-default-pool-3459fe6a 2m 12Mi
kube-system kube-proxy-gke-rel3170-default-pool-3459fe6a 2m 12Mi
kube-system fluentd-gcp-v2.0.9-5t9q6 8m 85Mi
kube-system fluentd-gcp-v2.0.9-pd4s9 10m 84Mi
However it doesn't show the quota limits of pods. It just shows current CPU and memory usage of pod. Hope this helps.
