Add support for prometheus for Plus (#249)

Author: pleshakov

docs/installation.md

@@ -149,6 +149,20 @@ For NGINX Plus, you can access the live activity monitoring dashboard:
     ```
 1. Open your browser at http://127.0.0.1:8080/dashboard.html to access the dashboard. 
 
+## Support For Prometheus Monitoring
+
+If you are using [Prometheus](https://prometheus.io/), you can deploy the NGINX Plus Ingress controller with the prometheus exporter for NGINX Plus. The exporter will export NGINX Plus metrics into your Prometheus. To deploy the Ingress controller with the exporter, use the modified manifests:
+* For a deployment, run:
+    ```
+    $ kubectl apply -f deployment/nginx-plus-ingress-with-prometheus.yaml
+    ```
+* For a daemon set, run:
+    ```
+    $ kubectl apply -f daemon-set/nginx-plus-ingress-with-prometheus.yaml
+    ```
+
+**Note**: this is a preview version of the prometheus exporter for NGINX Plus. It is not suitable for using in production environments.
+
 ## Uninstall the Ingress Controller
 
 Delete the `nginx-ingress` namespace to uninstall the Ingress controller along with all the auxiliary resources that were created:

docs/nginx-ingress-controllers.md

@@ -33,7 +33,7 @@ The table below summarizes the key difference between nginxinc/kubernetes-ingres
 | **Operational** |
 | Reporting the IP address(es) of the Ingress controller into Ingress resources | Supported | Coming soon | Coming soon |
 | Extended Status | Supported via a third-party module | Not supported | Supported |
-| Prometheus Integration | Supported | Not supported | Coming soon |
+| Prometheus Integration | Supported | Not supported | Supported |
 | Dynamic reconfiguration of endpoints (no configuration reloading) | Not supported | Not supported | Supported |
 
 Notes:

install/daemon-set/nginx-plus-ingress-with-prometheus.yaml

@@ -0,0 +1,46 @@
+apiVersion: extensions/v1beta1
+kind: DaemonSet
+metadata:
+  name: nginx-ingress
+  namespace: nginx-ingress
+spec:
+  selector:
+    matchLabels:
+      app: nginx-ingress
+  template:
+    metadata:
+      labels:
+        app: nginx-ingress
+      annotations:
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "8090"
+    spec:
+      serviceAccountName: nginx-ingress
+      containers:
+      - image: nginx-plus-ingress:1.1.1
+        name: nginx-plus-ingress
+        ports:
+        - name: http
+          containerPort: 80
+          hostPort: 80
+        - name: https
+          containerPort: 443
+          hostPort: 443
+        env:
+        - name: POD_NAMESPACE
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace
+        args:
+          - -nginx-plus
+          - -nginx-configmaps=$(POD_NAMESPACE)/nginx-config
+          - -default-server-tls-secret=$(POD_NAMESPACE)/default-server-secret
+         #- -v=3 # Enables extensive logging. Useful for trooublshooting.
+      - image: nginxdemos/nginxplus-prometheus-exporter:0.1.0
+        name: nginxplus-prometheus-exporter
+        args:
+          - -listen-address
+          - :8090
+          - -plus
+          - -metric-endpoint
+          - http://127.0.0.1:8080/api

install/deployment/nginx-plus-ingress-with-prometheus.yaml

@@ -0,0 +1,45 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: nginx-ingress
+  namespace: nginx-ingress
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: nginx-ingress
+  template:
+    metadata:
+      labels:
+        app: nginx-ingress
+      annotations:
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "8090"
+    spec:
+      serviceAccountName: nginx-ingress
+      containers:
+      - image: nginx-plus-ingress:1.1.1
+        name: nginx-plus-ingress
+        ports:
+        - name: http
+          containerPort: 80
+        - name: https
+          containerPort: 443
+        env:
+        - name: POD_NAMESPACE
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace
+        args:
+          - -nginx-plus
+          - -nginx-configmaps=$(POD_NAMESPACE)/nginx-config
+          - -default-server-tls-secret=$(POD_NAMESPACE)/default-server-secret
+         #- -v=3 # Enables extensive logging. Useful for trooublshooting.
+      - image: nginxdemos/nginxplus-prometheus-exporter:0.1.0
+        name: nginxplus-prometheus-exporter
+        args:
+          - -listen-address
+          - :8090
+          - -plus
+          - -metric-endpoint
+          - http://127.0.0.1:8080/api