Update rabbitmq alerts (#1383)

* Update rabbitmq alerts

* Fix alert

Author: v-zhuravlev

rabbitmq-mixin/alerts/clusterAlerts.yaml

@@ -29,19 +29,12 @@ groups:
       description: "A queue has unroutable messages on {{ $labels.instance }}."
 
   - alert: RabbitMQNodeNotDistributed
-    expr: erlang_vm_dist_node_state < 3
-    for: 2m
+    expr: erlang_vm_dist_node_state{rabbitmq_cluster!=""} < 3
+    for: 5m
     labels:
       severity: critical
     annotations:
       summary: 'RabbitMQ node not distributed, link state is down.'
-      description: "Distribution link state is not 'up' on {{ $labels.instance }}."
-  
-  - alert: RabbitMQNodeDown
-    expr: sum by (rabbitmq_cluster) (rabbitmq_identity_info) < 3
-    for: 0m
-    labels:
-      severity: critical
-    annotations:
-      summary: 'RabbitMQ node is down.'
-      description: "Less than 3 nodes running in RabbitMQ cluster\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
+      description: |-
+        Distribution link state is not 'up' on {{ $labels.instance }}, current value is {{ $value }}. 
+        Note: The state is represented as a numerical value where pending=1, up_pending=2 and up=3.

rabbitmq-mixin/mixin.libsonnet

@@ -10,6 +10,6 @@
     groups+: std.parseYaml(rules).groups,
   },
 
-  prometheusAlerts+:
+  prometheusAlerts+::
     importRules(importstr 'alerts/clusterAlerts.yaml'),
 }