An example of a production cluster configuration.

Closes #398

Author: mkuratczyk

Diff for: docs/examples/production/README.md

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+# Production Example
+
+This is an example of a good starting point for a production RabbitMQ deployment. It deploys a 3-node cluster with enough resources to handle reasonable traffic.
+
+Please keep in mind that:
+
+1. It may not be suitable for YOUR production deployment. Please go through the [Production Checklist](https://www.rabbitmq.com/production-checklist.html) to learn more about production deployment considerations.
+
+2. While it is important to correctly deploy RabbitMQ cluster for production deployment, it is even more important to correctly use RabbitMQ from your applications. [Production Checklist](https://www.rabbitmq.com/production-checklist.html) covers some of the common issues such as connection churn and polling cunsumers. Please also consider using [Quorum Queues](https://www.rabbitmq.com/quorum-queues.html) since they provide better data safety.
+
+You can deploy this example like this:
+
+```shell
+kubectl apply -f rabbitmq.yaml
+```
+
+Please keep in mind that you need a multi-zone Kubernetes cluster with 6 CPUs, 24Gi RAM, 384Gi disk space available as well as a `storageClass` called `ssd` to deploy this example as-is. Of course you can adjust these values to your environment if needed.

Diff for: docs/examples/production/rabbitmq.yaml

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+apiVersion: rabbitmq.com/v1beta1
+kind: RabbitmqCluster
+metadata:
+  name: production
+spec:
+  replicas: 3
+  resources:
+    requests:
+      cpu: 2
+      memory: 8Gi
+    limits:
+      cpu: 2
+      memory: 8Gi
+  rabbitmq:
+    additionalConfig: |
+      cluster_partition_handling = ignore
+      vm_memory_high_watermark_paging_ratio = 0.99
+      disk_free_limit.relative = 1.0
+  persistence:
+    storageClassName: ssd
+    storage: "128Gi"
+  override:
+    statefulSet:
+      spec:
+        template:
+          spec:
+            containers: []
+            topologySpreadConstraints:
+            - maxSkew: 1
+              topologyKey: zone
+              whenUnsatisfiable: DoNotSchedule
+              labelSelector:
+                matchLabels:
+                  app.kubernetes.io/component: rabbitmq