Allow extensions to define cluster features (#1125)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

extensions/metrics-cluster-feature/resources/10-node-exporter-ds.yml.hb

@@ -0,0 +1,84 @@
+{{#if nodeExporter.enabled}}
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: node-exporter
+  namespace: lens-metrics
+spec:
+  updateStrategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 1
+  selector:
+    matchLabels:
+      name: node-exporter
+      phase: prod
+  template:
+    metadata:
+      labels:
+        name: node-exporter
+        phase: prod
+      annotations:
+        seccomp.security.alpha.kubernetes.io/pod: 'docker/default'
+    spec:
+      affinity:
+        nodeAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            nodeSelectorTerms:
+              - matchExpressions:
+                - key: kubernetes.io/os
+                  operator: In
+                  values:
+                  - linux
+              - matchExpressions:
+                - key: beta.kubernetes.io/os
+                  operator: In
+                  values:
+                  - linux
+      securityContext:
+        runAsNonRoot: true
+        runAsUser: 65534
+      hostPID: true
+      containers:
+      - name: node-exporter
+        image: docker.io/prom/node-exporter:v1.0.0-rc.0
+        args:
+          - --path.procfs=/host/proc
+          - --path.sysfs=/host/sys
+          - --path.rootfs=/host/root
+          - --collector.filesystem.ignored-mount-points=^/(dev|proc|sys|var/lib/docker|var/lib/containers/.+)($|/)
+          - --collector.filesystem.ignored-fs-types=^(autofs|binfmt_misc|cgroup|configfs|debugfs|devpts|devtmpfs|fusectl|hugetlbfs|mqueue|overlay|proc|procfs|pstore|rpc_pipefs|securityfs|sysfs|tracefs)$
+        ports:
+          - name: metrics
+            containerPort: 9100
+        resources:
+          requests:
+            cpu: 10m
+            memory: 24Mi
+          limits:
+            cpu: 200m
+            memory: 100Mi
+        volumeMounts:
+          - name: proc
+            mountPath: /host/proc
+            readOnly:  true
+          - name: sys
+            mountPath: /host/sys
+            readOnly: true
+          - name: root
+            mountPath: /host/root
+            readOnly: true
+      tolerations:
+        - effect: NoSchedule
+          operator: Exists
+      volumes:
+        - name: proc
+          hostPath:
+            path: /proc
+        - name: sys
+          hostPath:
+            path: /sys
+        - name: root
+          hostPath:
+            path: /
+{{/if}}