Delete a pod with status unknown or wont terminate
if you see:
slack-49400829-7rttv 0/1 Unknown 0 54m
kubectl delete pods slack-49400829-7rttv --grace-period=0 --force
if you see:
slack-49400829-7rttv 0/1 Unknown 0 54m
kubectl delete pods slack-49400829-7rttv --grace-period=0 --force