Merge pull request #1314 from katcipis/master

Adding RabbitMQ deploy for kubernetes + prometheus integration

documentation/examples/kubernetes-rabbitmq/README.md

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+# RabbitMQ Scraping
+
+This is an example on how to setup RabbitMQ so Prometheus can scrape data from it.
+It uses a third party [RabbitMQ exporter](https://github.com/kbudde/rabbitmq_exporter).
+
+Since the [RabbitMQ exporter](https://github.com/kbudde/rabbitmq_exporter) needs to
+scrape the RabbitMQ management API to scrap data, and it defaults to localhost, it is
+easier to simply embed the **kbudde/rabbitmq-exporter** on the same pod as RabbitMQ,
+this way they share the same network.
+
+With this pod running you will have the exporter scraping data, but Prometheus has not
+yet found the exporter and is not scraping data from it.
+
+For more details on how to use Kubernetes service discovery take a look at the 
+[documentation](http://prometheus.io/docs/operating/configuration/#kubernetes-sd-configurations-kubernetes_sd_config)
+and at the [available examples](./documentation/examples).
+
+After you got Kubernetes service discovery up and running you just need to advertise that RabbitMQ
+is exposing metrics. To do that you need to define a service that:
+
+* Exposes the exporter port
+* Has a **prometheus.io/scrape: "true"** annotation
+* Has a **prometheus.io/port: "9090"** annotation
+
+And you should be able to see your RabbitMQ exporter being scraped on the Prometheus status page.
+Since the IP that will be scraped will be the pod endpoint it is important that the node
+where Prometheus is running has access to the Kubernetes overlay network
+(flannel, Weave, AWS, or any of the other options that Kubernetes gives to you).

documentation/examples/kubernetes-rabbitmq/rc.yml

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+apiVersion: v1
+kind: ReplicationController
+metadata:
+  name: rabbitmq
+spec:
+  replicas: 1
+  selector:
+    app: rabbitmq
+  template:
+    metadata:
+      name: rabbitmq
+      labels:
+        app: rabbitmq
+    spec:
+      containers:
+      - image: rabbitmq:3.5.4-management
+        name: rabbitmq
+        ports:
+        - containerPort: 5672
+          name: service
+        - containerPort: 15672
+          name: management
+      - image: kbudde/rabbitmq-exporter
+        name: rabbitmq-exporter
+        ports:
+        - containerPort: 9090
+          name: exporter

documentation/examples/kubernetes-rabbitmq/svc.yml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: rabbitmq
+  labels:
+    name: rabbitmq
+  annotations:
+    prometheus.io/scrape: "true"
+    prometheus.io/port: "9090"
+spec:
+  ports:
+    - port: 9090
+      name: exporter
+      targetPort: exporter
+      protocol: TCP
+  selector:
+    app: rabbitmq