I have a deployment in k8s environment and ran `ctop` command to see memory and cpu utilization. 

`NAME CID CPU MEM NET RX/TX IO R/W PIDS
 ◉ k8s_POD_pod1-… c029e2492e7b 0% 1M / 23.54G 0B / 0B 0B / 0B 1
 ◉ k8s_pod1_… 411fc43165fe 6% 23M / 23.54G 0B / 0B 0B / 0B 115`
why there are `k8s_POD_*` and `k8s_*`, two containers for single entity?