From 82ac662075e593e03eddba3722fb6f43a027dbfa Mon Sep 17 00:00:00 2001
From: Gerrit <info@gerritschwerthelm.de>
Date: Fri, 7 Jul 2023 10:16:06 +0200
Subject: [PATCH] Add gardener-metrics-exporter.

---
 .../roles/monitoring/defaults/main/main.yaml  |   8 ++
 .../roles/monitoring/tasks/exporters.yaml     |   8 +-
 .../gardener-metrics-exporter.yaml            | 104 ++++++++++++++++++
 3 files changed, 119 insertions(+), 1 deletion(-)
 create mode 100644 control-plane/roles/monitoring/templates/metrics-exporters/gardener-metrics-exporter.yaml

diff --git a/control-plane/roles/monitoring/defaults/main/main.yaml b/control-plane/roles/monitoring/defaults/main/main.yaml
index 140bf8109..c607be191 100644
--- a/control-plane/roles/monitoring/defaults/main/main.yaml
+++ b/control-plane/roles/monitoring/defaults/main/main.yaml
@@ -40,3 +40,11 @@ monitoring_metal_api_hmac: "metal-admin"
 # rethinkdb exporter
 monitoring_rethinkdb_exporter_metal_db_password: "change-me"
 monitoring_rethinkdb_exporter_metal_db_endpoint: metal-db.metal-control-plane:28015
+
+# gardener
+monitoring_gardener_enabled: false
+monitoring_gardener_virtual_garden_kubeconfig: "{{ lookup('k8s', api_version='v1', kind='Secret', namespace='garden', resource_name='garden-kubeconfig-for-admin').get('data', {}).get('kubeconfig') if monitoring_gardener_enabled else None }}"
+
+# TODO: move into release vector
+monitoring_gardener_metrics_exporter_image_name: eu.gcr.io/gardener-project/gardener/metrics-exporter
+monitoring_gardener_metrics_exporter_image_tag: "0.20.0"
diff --git a/control-plane/roles/monitoring/tasks/exporters.yaml b/control-plane/roles/monitoring/tasks/exporters.yaml
index b597856d3..1c61d602d 100644
--- a/control-plane/roles/monitoring/tasks/exporters.yaml
+++ b/control-plane/roles/monitoring/tasks/exporters.yaml
@@ -17,6 +17,13 @@
     namespace: "{{ monitoring_namespace }}"
     apply: true
 
+- name: Deploy gardener-metrics-exporter
+  k8s:
+    definition: "{{ lookup('template', 'metrics-exporters/gardener-metrics-exporter.yaml') }}"
+    namespace: "{{ monitoring_namespace }}"
+    apply: true
+  when: monitoring_gardener_enabled
+
 - name: Add webhook-logger
   k8s:
     definition: "{{ lookup('template', item) }}"
@@ -25,4 +32,3 @@
   loop:
     - webhook-logger-Service.yaml
     - webhook-logger-Deployment.yaml
-  
diff --git a/control-plane/roles/monitoring/templates/metrics-exporters/gardener-metrics-exporter.yaml b/control-plane/roles/monitoring/templates/metrics-exporters/gardener-metrics-exporter.yaml
new file mode 100644
index 000000000..0dae793b2
--- /dev/null
+++ b/control-plane/roles/monitoring/templates/metrics-exporters/gardener-metrics-exporter.yaml
@@ -0,0 +1,104 @@
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: gardener-metrics-exporter
+  labels:
+    app: gardener
+    role: metrics-exporter
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: gardener.cloud:metrics-exporter
+rules:
+- apiGroups:
+  - core.gardener.cloud
+  resources:
+  - shoots
+  - projects
+  - seeds
+  - plants
+  verbs:
+  - get
+  - watch
+  - list
+---
+kind: ClusterRoleBinding
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: gardener.cloud:metrics-exporter
+subjects:
+- kind: ServiceAccount
+  name: gardener-metrics-exporter
+  namespace: {{ monitoring_namespace }}
+roleRef:
+  kind: ClusterRole
+  name: gardener.cloud:metrics-exporter
+  apiGroup: rbac.authorization.k8s.io
+apiVersion: v1
+kind: Secret
+metadata:
+  name: seed-kubecfg
+data:
+  kubecfg.yaml: {{ monitoring_gardener_virtual_garden_kubeconfig }}
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: gardener-metrics-exporter
+  labels:
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: gardener
+      role: metrics-exporter
+  template:
+    metadata:
+      labels:
+        app: gardener
+        role: metrics-exporter
+    spec:
+      serviceAccountName: gardener-metrics-exporter
+      automountServiceAccountToken: false
+      containers:
+      - name: gardener-metrics-exporter
+        image: {{ monitoring_gardener_metrics_exporter_image_name }}:{{ monitoring_gardener_metrics_exporter_image_tag }}
+        imagePullPolicy: {{ metal_control_plane_image_pull_policy }}
+        command:
+        - /gardener-metrics-exporter
+        - --bind-address=0.0.0.0
+        - --port=2718
+        - --kubeconfig=/etc/seed/kubecfg.yaml
+        ports:
+        - name: port
+          containerPort: 2718
+        volumeMounts:
+          - mountPath: /etc/seed
+            name: seed-kubecfg
+            readOnly: true
+        securityContext:
+          allowPrivilegeEscalation: false
+          runAsNonRoot: true
+      volumes:
+        - name: seed-kubecfg
+          secret:
+            defaultMode: 420
+            secretName: seed-kubecfg
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: gardener-metrics-exporter
+  labels:
+spec:
+  type: ClusterIP
+  sessionAffinity: None
+  selector:
+    app: gardener
+    role: metrics-exporter
+  ports:
+  - protocol: TCP
+    port: 2718
+    targetPort: 2718