Revert "Merge pull request #1702 from stackhpc/update-rabbitmq-rule"

This reverts commit c9c3eba, reversing
changes made to ddd4daa.

The metric `erlang_vm_dist_node_state` should not be compared against
the size of the `RabbitMQ` cluster as the values indicate the current
state of the link with `3` implying the connection is `up`.

Author: jackhodgkiss

etc/kayobe/kolla/config/prometheus/rabbitmq.rules

@@ -20,7 +20,7 @@ groups:
     annotations:
       description: RabbitMQ consumers message consumption speed is low on {{ $labels.instance }}
   - alert: RabbitMQNodeNotDistributed
-    expr: erlang_vm_dist_node_state < {% endraw %}{{ alertmanager_number_of_rabbitmq_nodes }}{% raw %}
+    expr: erlang_vm_dist_node_state < 3
     for: 5m
     labels:
       severity: critical