kubectl-top: add page

pages/common/kubectl-top.md

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+# kubectl top
+
+> See the resource consumption for nodes or pods.
+> More information: <https://kubernetes.io/docs/reference/kubectl/generated/kubectl_top>.
+
+- Get the resource consumption of all nodes:
+
+`kubectl top {{node|nodes}}`
+
+- Get resource consumption of a specific node:
+
+`kubectl top {{node|nodes}} {{node_name}}`
+
+- Get resource consumption of all pods:
+
+`kubectl top {{po|pod|pods}}`
+
+- Get resource consumption of a specific pod:
+
+`kubectl top {{po|pod|pods}} {{pod_name}}`
+
+- Get resource consumption of all pods in a namespace:
+
+`kubectl top {{po|pod|pods}} --namespace {{namespace_name}}`
+
+- Get resource consumption of all containers in a pod:
+
+`kubectl top {{po|pod|pods}} --containers`
+
+- Get resource consumption of all pods with specified label:
+
+`kubectl top {{po|pod|pods}} -l {{key=value}}`