[Question] How to include labels for every configmap in a configmapList?

[KR411-prog]

I have a yaml file like below.This yaml file needs to be patched with a new label under each configmap.

apiVersion: v1
kind: ConfigMapList
items:
  - apiVersion: v1
    data:
      test: 1
    kind: ConfigMap
    metadata:
      name: grafana-dashboard-apiserver1
      namespace: monitoring   
  - apiVersion: v1
    data:
      test: 2
    kind: ConfigMap
    metadata:
      name: grafana-dashboard-apiserver2
      namespace: monitoring   
  - apiVersion: v1
    data:
      test: 3
    kind: ConfigMap
    metadata:
      name: grafana-dashboard-apiserver3
      namespace: monitoring    

I want to insert labels under every configmap in this configmaplist as below,

apiVersion: v1
kind: ConfigMapList
items:
  - apiVersion: v1
    data:
      test: 1
    kind: ConfigMap
    metadata:
      name: grafana-dashboard-apiserver1
      namespace: monitoring
      labels:
        grafana_dashboard: "1"   
  - apiVersion: v1
    data:
      test: 2
    kind: ConfigMap
    metadata:
      name: grafana-dashboard-apiserver2
      namespace: monitoring   
      labels:
        grafana_dashboard: "1" 
  - apiVersion: v1
    data:
      test: 3
    kind: ConfigMap
    metadata:
      name: grafana-dashboard-apiserver3
      namespace: monitoring    
      labels:
        grafana_dashboard: "1" 

I tried to do this using Kustomize by following https://kubectl.docs.kubernetes.io/pages/app_customization/customizing_arbitrary_fields.html. But its not working.

Here is my file,

overlays/patch.yaml
- op: add
  path: /items/?/metadata/labels/testlabel
  value: test

overlays/kustomization.yaml

bases:
- ../base
patchesJson6902:
- target:
    kind: ConfigMapList
  path: patch.yaml

Since ConfigMapList does not contain a name, its not working in target,
but it reports error as , `: must specify the target name
How to do patching in ConfigMapList?
Also for the patch.yaml file,I have used "?" here in this example..but I am not sure what to use to replace it..because it is around 100 different configmaps under items.Should I use wildcard * ?

[pantaoran]

I have the exact same question/problem. I need to add an annotation to every item in a list, and the annotation should be different for every environment.

[Shell32-Natsu]

1. Please use patches instead of patchesJson6902.
2. *List resources will be parsed to a list of resources in kustomize instead of a single resource. So there is no ConfigMapList in kustomize but a list of ConfigMap. In target.kind you should use ConfigMap.
3. JSON patch requires the path except last item does exist. If you want to add a label /metadata/labels/testlabel, /metadata/labels must exist.
4. If you just want to add labels, you can use LabelTransformer and custom fieldSpec to add labels to a list. doc

Transformer YAML:

apiVersion: builtin
kind: LabelTransformer
metadata:
  name: notImportantHere
labels:
  app: hello
fieldSpecs:
- kind: ConfigMap
  path: /metadata/labels
  create: true

Then add

transformers:
- label_transformer.yaml

to the kustomization.yaml file.