fix(argocd): multisource patch doc, Ingress grafana-onelab

- Root cause: live Application kept spec.source; Argo ignored observability chart
- Add jsonpatch-multisource.json + argocd/README.md migration steps
- Grafana: disable subchart ingress; add templates/ingress-grafana-onelab.yaml

Made-with: Cursor

gitops/argocd/README.md

@@ -0,0 +1,27 @@
+# Argo CD Application
+
+Apply the Application:
+
+```bash
+kubectl apply -f gitops/argocd/application.yaml
+```
+
+## Migrating from `spec.source` to `spec.sources`
+
+If the `onelab` Application was created **before** the observability stack, the live object may still have **`spec.source`** only. A plain `kubectl apply` of the new manifest often **does not remove** `spec.source`, so Argo never reconciles the second chart (Loki/Promtail/Grafana).
+
+**Check:**
+
+```bash
+kubectl get application onelab -n argocd -o jsonpath='{.spec.source}{"\n"}{.spec.sources}{"\n"}'
+```
+
+If `source` is set and `sources` is empty, patch once:
+
+```bash
+kubectl patch application onelab -n argocd --type json --patch-file gitops/argocd/jsonpatch-multisource.json
+```
+
+Then sync the app in Argo (or wait for auto-sync).
+
+Adjust `repoURL` in `jsonpatch-multisource.json` if your remote differs.

gitops/argocd/application.yaml

@@ -1,5 +1,8 @@
 # Syncs OneLab app + observability (Loki/Promtail/Grafana) into namespace onelab.
 # Requires Argo CD 2.6+ (spec.sources). Ensure repoURL matches your remote.
+#
+# If you already had this Application with spec.source only, kubectl apply may not drop
+# source — see README.md in this folder and jsonpatch-multisource.json.
 apiVersion: argoproj.io/v1alpha1
 kind: Application
 metadata:

gitops/argocd/jsonpatch-multisource.json

@@ -0,0 +1,23 @@
+[
+  {"op": "remove", "path": "/spec/source"},
+  {"op": "add", "path": "/spec/sources", "value": [
+    {
+      "repoURL": "https://git.luneski.fr/luneski/onelab-k8s.git",
+      "targetRevision": "main",
+      "path": "gitops/charts/onelab",
+      "helm": {
+        "releaseName": "onelab",
+        "valueFiles": ["../../values/k3s-example.yaml"]
+      }
+    },
+    {
+      "repoURL": "https://git.luneski.fr/luneski/onelab-k8s.git",
+      "targetRevision": "main",
+      "path": "gitops/observability",
+      "helm": {
+        "releaseName": "onelab-obs",
+        "valueFiles": ["values.yaml"]
+      }
+    }
+  ]}
+]