Plan:

1. Prometheus: Ensure Prometheus is deployed (T1623)
2. Docker: in rOPS pillar/paas/docker.sls, enable 15692 in rabbitmq_ports (currently commented)
3. RabbitMQ: ensure the cluster has a name, regardless it's 1 or 3 nodes
4. RabbitMQ: enable rabbitmq_prometheus plugin
5. Prometheus: configure RabbitMQ
6. Grafana: create a dashboard

Reference: https://www.rabbitmq.com/prometheus.html