How can I summarize all the resource limits and requests in Kubernetes with kubectl?

I started using Lens and noticed that it gives you some warnings when the pods inside the nodes have limits higher than the actual capacity.

So I tried to get this information with kubectl but I'm new to jsonpath and I just managed to get the raw info using something like this:

kubectl get pods -o=jsonpath='{.items..resources.limits}' -A

That produces something like this:

{"cpu":"200m","memory":"1Gi"} {"cpu":"200m","memory":"1Gi"} {"cpu":"200m","memory":"512Mi"} {"cpu":"500m","memory":"250Mi"} {"memory":"170Mi"} {"memory":"170Mi"} {"cpu":"2","memory":"2Gi"} {"cpu":"2","memory":"2Gi"} {"cpu":"2","memory":"2Gi"} {"cpu":"1","memory":"1Gi"} {"cpu":"1","memory":"1Gi"} {"cpu":"2","memory":"2Gi"} {"cpu":"100m","memory":"128Mi"} {"cpu":"100m","memory":"128Mi"} {"cpu":"500m","memory":"600Mi"} {"cpu":"1","memory":"1Gi"} {"cpu":"100m","memory":"25Mi"} {"cpu":"100m","memory":"25Mi"}

So, my questions are, how can I sum all these values? Will these values be accurate or am I missing any other query? I've checked using LimitRange and the values I got seem to be correct, the results include the limits set by the LimitRange configuration.

It is not possible with just kubectl commands. However, you can use the output of kubectl and write a basic shell script to compute the total values.

The following shell script will output total CPU limits(in m units) of all the pods in all namespaces.

res=$(kubectl get pods -o=jsonpath='{.items[*]..resources.limits.cpu}' -A)
let tot=0
for i in $res
do
   if [[ $i =~ "m" ]]; then
      i=$(echo $i | sed 's/[^0-9]*//g')
      tot=$(( tot + i ))
   else
      tot=$(( tot + i*1000 ))
   fi
done
echo $tot

You can extend the above to compute the CPU requests and the memory requests and limits values as well.