kubectl: kubectl delete leaks network connections when deleting multiple resources, causing warnings or errors

What happened:

kubectl delete leaks network connections when deleting multiple resources, causing warnings or errors

What you expected to happen:

kubectl to not leak network connections

How to reproduce it (as minimally and precisely as possible):

1. Create 1001+ pods
2. Perform kubectl delete pod -l mypod=foo

Receive warning (Linux):

W1011 16:39:05.007295 3346 exec.go:282] constructing many client instances from the same exec auth config can cause performance problems during cert rotation and can exhaust available network connections; 1001 clients constructed calling “aws”

Receive error (macOS):

socket: too many open files

Anything else we need to know?:

Environment:

• Kubernetes client and server versions (use kubectl version):

  Client Version: version.Info{Major:"1", Minor:"20", GitVersion:"v1.20.5", GitCommit:"6b1d87acf3c8253c123756b9e61dac642678305f", GitTreeState:"archive", BuildDate:"2021-03-30T00:00:00Z", GoVersion:"go1.16", Compiler:"gc", Platform:"linux/amd64"}
  Server Version: version.Info{Major:"1", Minor:"21+", GitVersion:"v1.21.2-eks-0389ca3", GitCommit:"8a4e27b9d88142bbdd21b997b532eb6d493df6d2", GitTreeState:"clean", BuildDate:"2021-07-31T01:34:46Z", GoVersion:"go1.16.5", Compiler:"gc", Platform:"linux/amd64"}
  

• Cloud provider or hardware configuration: AWS EKS, authenticated to via AWS SSO.
• OS (e.g: cat /etc/os-release): Linux and macOS