[stable/grafana] Add gerrit server as dashboard origin (#10711)

* [stable/grafana] Add gerrit server as dashboard origin

Signed-off-by: cesaralbloz <cesaralbloz@hotmail.com>

* [stable/grafana] Add gerrit server as dashboard origin

Signed-off-by: Cesar Alba Lozano <cesaralbloz@hotmail.com>

stable/grafana/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: grafana
-version: 1.25.2
+version: 1.25.3
 appVersion: 5.4.3
 kubeVersion: "^1.8.0-0"
 description: The leading tool for querying and visualizing time series and metrics.

stable/grafana/README.md

@@ -91,6 +91,17 @@ The command removes all the Kubernetes components associated with the chart and
 | `rbac.pspEnabled`                         | Create PodSecurityPolicy (with `rbac.create`, grant roles permissions as well) | `true` |
 | `rbac.pspUseAppArmor`                     | Enforce AppArmor in created PodSecurityPolicy (requires `rbac.pspEnabled`)  | `true` |
 
+## BASE64 dashboards
+
+Dashboards could be storaged in a server that does not return JSON directly and instead of it returns a Base64 encoded file (e.g. Gerrit)
+A new parameter has been added to the url use case so if you specify a b64content value equals to true after the url entry a Base64 decoding is applied before save the file to disk. 
+If this entry is not set or is equals to false not decoding is applied to the file before saving it to disk.
+
+### Gerrit use case: 
+Gerrit API for download files has the following schema: https://yourgerritserver/a/{project-name}/branches/{branch-id}/files/{file-id}/content where {project-name} and
+{file-id} usualy has '/' in their values and so they MUST be replaced by %2F so if project-name is user/repo, branch-id is master and file-id is equals to dir1/dir2/dashboard 
+the url value is https://yourgerritserver/a/user%2Frepo/branches/master/files/dir1%2Fdir2%2Fdashboard/content
+
 ## Sidecar for dashboards
 
 If the parameter `sidecar.dashboards.enabled` is set, a sidecar container is deployed in the grafana pod. This container watches all config maps in the cluster and filters out the ones with a label as defined in `sidecar.dashboards.label`. The files defined in those configmaps are written to a folder and accessed by grafana. Changes to the configmaps are monitored and the imported dashboards are deleted/updated. A recommendation is to use one configmap per dashboard, as an reduction of multiple dashboards inside one configmap is currently not properly mirrored in grafana.

stable/grafana/templates/configmap.yaml

@@ -52,11 +52,13 @@ data:
     curl -sk \
     --connect-timeout 60 \
     --max-time 60 \
+      {{- if not $value.b64content }}
     -H "Accept: application/json" \
     -H "Content-Type: application/json;charset=UTF-8" \
-    {{- if $value.url -}}{{ $value.url }}{{- else -}} https://grafana.com/api/dashboards/{{ $value.gnetId }}/revisions/{{- if $value.revision -}}{{ $value.revision }}{{- else -}}1{{- end -}}/download{{- end -}}{{ if $value.datasource }}| sed 's|\"datasource\":[^,]*|\"datasource\": \"{{ $value.datasource }}\"|g'{{ end }} \
-    > /var/lib/grafana/dashboards/{{ $provider }}/{{ $key }}.json
       {{- end }}
+    {{- if $value.url -}}{{ $value.url }}{{- else -}} https://grafana.com/api/dashboards/{{ $value.gnetId }}/revisions/{{- if $value.revision -}}{{ $value.revision }}{{- else -}}1{{- end -}}/download{{- end -}}{{ if $value.datasource }}| sed 's|\"datasource\":[^,]*|\"datasource\": \"{{ $value.datasource }}\"|g'{{ end }}{{- if $value.b64content -}} | base64 -d {{- end -}} \
+    > /var/lib/grafana/dashboards/{{ $provider }}/{{ $key }}.json
+      {{- end -}}
     {{- end }}
   {{- end }}
 {{- end }}

stable/grafana/values.yaml

@@ -217,6 +217,9 @@ dashboards: {}
 #      datasource: Prometheus
 #    local-dashboard:
 #      url: https://example.com/repository/test.json
+#    local-dashboard-base64:
+#      url: https://example.com/repository/test-b64.json
+#      b64content: true
 
 ## Reference to external ConfigMap per provider. Use provider name as key and ConfiMap name as value.
 ## A provider dashboards must be defined either by external ConfigMaps or in values.yaml, not in both.