kubernetes: kubectl alpha debug node does not work on tainted nodes

What happened:

kubectl alpha debug node does not work for nodes with NoExecute taints.

$ kubectl alpha debug node/mynode -it --image=ubuntu
Creating debugging pod node-debugger-mynode-mnn2s with container debugger on node mynode.
Error from server (NotFound): pods "" not found

We have several types of Node hardware, and some of them are tainted to keep away normal pods.

What you expected to happen:

A debug pod is created with tolerations for the taints.

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

1. Add a NoExecute taint to a node
2. Run kubectl alpha debug node on the node

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version): 1.19.7
• OS (e.g: cat /etc/os-release):

  NAME="Flatcar Container Linux by Kinvolk"
  ID=flatcar
  ID_LIKE=coreos
  VERSION=2605.11.0
  VERSION_ID=2605.11.0
  BUILD_ID=2021-01-08-2026
  PRETTY_NAME="Flatcar Container Linux by Kinvolk 2605.11.0 (Oklo)"
  ANSI_COLOR="38;5;75"
  HOME_URL="https://flatcar-linux.org/"
  BUG_REPORT_URL="https://issues.flatcar-linux.org"
  FLATCAR_BOARD="amd64-usr"
  

• Kernel (e.g. uname -a): Linux hostname 5.4.87-flatcar #1 SMP Fri Jan 8 19:54:07 -00 2021 x86_64 Intel(R) Xeon(R) Silver 4114 CPU @ 2.20GHz GenuineIntel GNU/Linux
• Install tools: CKE
• Network plugin and version (if this is a network-related bug): Coil v2.0.5
• Others: