Add documentation to install prometheus and grafana

deploy/monitoring/grafana.yaml

@@ -0,0 +1,57 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  labels:
+    name: grafana
+  name: grafana
+  namespace: ingress-nginx
+spec:
+  selector:
+    matchLabels:
+      app: grafana
+  strategy:
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 1
+    type: RollingUpdate
+  template:
+    metadata:
+      labels:
+        app: grafana
+    spec:
+      containers:
+      - image: grafana/grafana
+        name: grafana
+        ports:
+        - containerPort: 3000
+          protocol: TCP
+        resources:
+          limits:
+            cpu: 500m
+            memory: 2500Mi
+          requests:
+            cpu: 100m
+            memory: 100Mi
+        volumeMounts:
+        - mountPath: /var/lib/grafana
+          name: data
+      restartPolicy: Always
+      volumes:
+      - emptyDir: {}
+        name: data
+
+---
+
+apiVersion: v1
+kind: Service
+metadata:
+  name: grafana
+  namespace: ingress-nginx
+spec:
+  ports:
+  - port: 3000
+    protocol: TCP
+    targetPort: 3000
+  selector:
+    app: grafana
+  type: NodePort