kubectl top pod

top pod + pod_name 或者 + namespace

# kubectl top pod idp-develop-b-executor-5b87fdc98d-jstsz
NAME                                      CPU(cores)   MEMORY(bytes)   
idp-develop-b-executor-5b87fdc98d-jstsz   5m           1155Mi

/sys/fs/cgroup/memory/memory.usage_in_bytes
/sys/fs/cgroup/cpu/cpuacct.usage
man 2 getrusage

Reference: https://stackoverflow.com/questions/54531646/checking-kubernetes-pod-cpu-and-memory