Using --v=3 does not return valid json for config

[soupdiver]

What happened:

To debug a configuration issue I added --v=3 to the pod to get the used configuration.

What you expected to happen:
According to the docs (https://kubernetes.github.io/ingress-nginx/troubleshooting/#debug-logging) the output should be in json format.

The output it not valid json.

NGINX Ingress controller version (exec into the pod and run nginx-ingress-controller --version.): 1.11.3

• Others:
  Snippet of my output:

"NGINX" configuration="{\"ProxySetHeaders\":{},\"AddHeaders\":{},\"BacklogSize\":4096,\"Backends\":[{\"name\":\"argocd-argocd-server-443\",\"service\":{\"metadata\":{\"name\":\"argocd-server\",\"namespace\":\"argocd\",\"uid\":\"43aca71d-7367-4c23-a9a2-5392b8697ede\",\"resourceVersion\":\"573228177\",\"creationTimestamp\":\"2023-01-04T17:30:59Z\",\"labels\":{\"app.kubernetes.io/component\":\"server\",\"app.kubernetes.io/instance\":\"argocd\",\"app.kubernetes.io/managed-by\":\"Helm\",\"app.kubernetes.io/name\":\"argocd-server\",\"app.kubernetes.io/part-of\":\"argocd\",\"app.kubernetes.io/version\":\"v2.9.3\",\"argocd.argoproj.io/instance\":\"argocd\",\"helm.sh/chart\":\"argo-cd-5.51.3\"},\"annotations\":{\"kubectl.kubernetes.io/last-applied-configuration\":\"{\\\"apiVersion\\\":\\\"v1\\\",\\\"kind\\\":\\\"Service\\\",\\\"metadata\\\":{\\\"annotations\\\":{},\\\"labels\\\":{\\\"app.kubernetes.io/component\\\":\\\"server\\\",\\\"app.kubernetes.io/instance\\\":\\\"argocd\\\",\\\"app.kubernetes.io/managed-by\\\":\\\"Helm\\\",\\\"app.kubernetes.i
...

I mean the bunch of \ would be easy to fix but it seems it just dump a k8s object. Unfortunately there are things like labels in there that I don't think belong to the nginx config iteself and then there is the last-applied-configuration which is embedded json and maybe this breaks it.

Would be nice to get an easy way to debug the config.

How to reproduce this issue:
Use --v=3

Anything else we need to know:
The resulting config is around 2k lines with a bunch of hosts so it's hard to format by hand

[k8s-ci-robot]

This issue is currently awaiting triage.

If Ingress contributors determines this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[longwuyuan]

% k -n ingress-nginx get po ingress-nginx-controller-7d978dd4c-kjhtj -v=8
I1110 08:27:36.472394 61107 loader.go:395] Config loaded from file: /home/me/.kube/config
I1110 08:27:36.472829 61107 cert_rotation.go:137] Starting client certificate rotation controller
I1110 08:27:36.475402 61107 round_trippers.go:463] GET https://192.168.58.2:8443/api/v1/namespaces/ingress-nginx/pods/ingress-nginx-controller-7d978dd4c-kjhtj
I1110 08:27:36.475411 61107 round_trippers.go:469] Request Headers:
I1110 08:27:36.475418 61107 round_trippers.go:473] User-Agent: kubectl/v1.30.2 (linux/amd64) kubernetes/3968350
I1110 08:27:36.475422 61107 round_trippers.go:473] Accept: application/json;as=Table;v=v1;g=meta.k8s.io,application/json;as=Table;v=v1beta1;g=meta.k8s.io,application/json
I1110 08:27:36.479631 61107 round_trippers.go:574] Response Status: 200 OK in 4 milliseconds
I1110 08:27:36.479645 61107 round_trippers.go:577] Response Headers:
I1110 08:27:36.479653 61107 round_trippers.go:580] Date: Sun, 10 Nov 2024 02:57:36 GMT
I1110 08:27:36.479659 61107 round_trippers.go:580] Audit-Id: 054c3ce7-4060-4a46-8551-c6aea895bcdb
I1110 08:27:36.479663 61107 round_trippers.go:580] Cache-Control: no-cache, private
I1110 08:27:36.479667 61107 round_trippers.go:580] Content-Type: application/json
I1110 08:27:36.479673 61107 round_trippers.go:580] X-Kubernetes-Pf-Flowschema-Uid: fd80cf0e-0c0e-481e-a769-f1865db13b69
I1110 08:27:36.479679 61107 round_trippers.go:580] X-Kubernetes-Pf-Prioritylevel-Uid: 2ad8acd0-3ef7-41c9-88b1-387bf1a3ac28
I1110 08:27:36.479779 61107 request.go:1212] Response Body: {"kind":"Table","apiVersion":"meta.k8s.io/v1","metadata":{"resourceVersion":"342205"},"columnDefinitions":[{"name":"Name","type":"string","format":"name","description":"Name must be unique within a namespace. Is required when creating resources, although some resources may allow a client to request the generation of an appropriate name automatically. Name is primarily intended for creation idempotence and configuration definition. Cannot be updated. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names#names","priority":0},{"name":"Ready","type":"string","format":"","description":"The aggregate readiness state of this pod for accepting traffic.","priority":0},{"name":"Status","type":"string","format":"","description":"The aggregate status of the containers in this pod.","priority":0},{"name":"Restarts","type":"string","format":"","description":"The number of times the containers in this pod have been restarted and when the last container in this pod has restarted.","priority":0},{ [truncated 6458 chars]
NAME READY STATUS RESTARTS AGE
ingress-nginx-controller-7d978dd4c-kjhtj 1/1 Running 2 (10m ago) 5d19h