Updated docs

docs/modules/ROOT/pages/how-tos/installation.adoc

@@ -4,6 +4,14 @@
 
 This component requires https://github.com/appuio/component-appuio-cloud-reporting[component-appuio-cloud-reporting] and is installed into the same namespace.
 This is required for this component to be able to access the billing database and its connection secrets.
+It also requires an Exoscale IAMKey and a K8sCluster access.
+
+== Sources
+
+The data is matched from k8s cluster and exoscale organization.
+Each source credentials are saved into the cronjob secret with a reference to vault.
+The K8s Service Account token is required to have read permissions on namespace and bucket (either exoscale or cloudscale) resources.
+The Access Key (IAM Key) from an exoscale organization is required to have read access across all buckets.
 
 == Example
 
@@ -16,10 +24,12 @@ parameters:
   exoscale_metrics_collector:
     namespace: 'appuio-cloud-reporting'
     secrets:
-      exoscale:
+      cronjob:
         stringData:
-          api_key: "?{vaultkv:${cluster:tenant}/${cluster:name}/exoscale-metrics-collector/api_key}"
-          api_secret: "?{vaultkv:${cluster:tenant}/${cluster:name}/exoscale-metrics-collector/api_secret}"
+          EXOSCALE_API_KEY: "?{vaultkv:${cluster:tenant}/${cluster:name}/${_instance}/exoscale-key}"
+          EXOSCALE_API_SECRET: "?{vaultkv:${cluster:tenant}/${cluster:name}/${_instance}/exoscale-secret}"
+          K8S_SERVER_URL: "?{vaultkv:${cluster:tenant}/${cluster:name}/${_instance}/cluster-server}"
+          K8S_TOKEN: "?{vaultkv:${cluster:tenant}/${cluster:name}/${_instance}/cluster-token}"
 ----
 
 See the xref:references/parameters.adoc[parameters] reference for a full list of parameters.

docs/modules/ROOT/pages/references/parameters.adoc

@@ -27,7 +27,7 @@ default:: `10 10,16,20 * * *`
 
 The cron schedule at which the metrics collection job is spawned.
 
-== `secrets.exoscale.stringData.api_key`
+== `secrets.exoscale.stringData.EXOSCALE_API_KEY`
 
 [horizontal]
 type:: string
@@ -38,7 +38,7 @@ The Exoscale API key.
 You need to get the token from the https://portal.exoscale.com[Exoscale Console].
 You need to select the correct account (token is limited to one account), choose "IAM" in the menu and generate a new key pair.
 
-== `secrets.exoscale.stringData.api_secret`
+== `secrets.exoscale.stringData.EXOSCALE_API_SECRET`
 
 [horizontal]
 type:: string
@@ -47,4 +47,22 @@ default:: Required.
 The Exoscale API secret.
 
 Second part of the Exoscale API credentials.
-See api_key for instructions.
+See EXOSCALE_API_KEY for instructions.
+
+== `secrets.exoscale.stringData.K8S_SERVER_URL`
+
+[horizontal]
+type:: string
+default:: Required.
+
+The Kubernetes server URL.
+
+== `secrets.exoscale.stringData.K8S_TOKEN`
+
+[horizontal]
+type:: string
+default:: Required.
+
+The token to connect to a Kubernetes cluster.
+
+The Service Account connected to this token should have access to bucket managed resource.