Add RabbitMQ cluster and running nodes count and running node status (#3703)

plugins/inputs/rabbitmq/README.md

@@ -61,6 +61,8 @@ For additional details reference the [RabbitMQ Management HTTP Stats](https://cd
   - messages_ready (int, messages)
   - messages_unacked (int, messages)
   - queues (int, queues)
+  - clustering_listeners (int, cluster nodes)
+  - amqp_listeners (int, amqp nodes up)
 
 - rabbitmq_node
   - disk_free (int, bytes)
@@ -74,6 +76,7 @@ For additional details reference the [RabbitMQ Management HTTP Stats](https://cd
   - run_queue (int, erlang processes)
   - sockets_total (int, sockets)
   - sockets_used (int, sockets)
+  - running (int, node up)
 
 - rabbitmq_queue
   - consumer_utilisation (float, percent)
@@ -144,7 +147,7 @@ FROM rabbitmq_overview WHERE time > now() - 10m GROUP BY time(1m)
 
 ```
 rabbitmq_queue,url=http://amqp.example.org:15672,queue=telegraf,vhost=influxdb,node=rabbit@amqp.example.org,durable=true,auto_delete=false,host=amqp.example.org messages_deliver_get=0i,messages_publish=329i,messages_publish_rate=0.2,messages_redeliver_rate=0,message_bytes_ready=0i,message_bytes_unacked=0i,messages_deliver=329i,messages_unack=0i,consumers=1i,idle_since="",messages=0i,messages_deliver_rate=0.2,messages_deliver_get_rate=0.2,messages_redeliver=0i,memory=43032i,message_bytes_ram=0i,messages_ack=329i,messages_ready=0i,messages_ack_rate=0.2,consumer_utilisation=1,message_bytes=0i,message_bytes_persist=0i 1493684035000000000
-rabbitmq_overview,url=http://amqp.example.org:15672,host=amqp.example.org channels=2i,consumers=1i,exchanges=17i,messages_acked=329i,messages=0i,messages_ready=0i,messages_unacked=0i,connections=2i,queues=1i,messages_delivered=329i,messages_published=329i 1493684035000000000
+rabbitmq_overview,url=http://amqp.example.org:15672,host=amqp.example.org channels=2i,consumers=1i,exchanges=17i,messages_acked=329i,messages=0i,messages_ready=0i,messages_unacked=0i,connections=2i,queues=1i,messages_delivered=329i,messages_published=329i,clustering_listeners=2i,amqp_listeners=1i 1493684035000000000
-rabbitmq_node,url=http://amqp.example.org:15672,node=rabbit@amqp.example.org,host=amqp.example.org fd_total=1024i,fd_used=32i,mem_limit=8363329126i,sockets_total=829i,disk_free=8175935488i,disk_free_limit=50000000i,mem_used=58771080i,proc_total=1048576i,proc_used=267i,run_queue=0i,sockets_used=2i 149368403500000000
+rabbitmq_node,url=http://amqp.example.org:15672,node=rabbit@amqp.example.org,host=amqp.example.org fd_total=1024i,fd_used=32i,mem_limit=8363329126i,sockets_total=829i,disk_free=8175935488i,disk_free_limit=50000000i,mem_used=58771080i,proc_total=1048576i,proc_used=267i,run_queue=0i,sockets_used=2i,running=1i 149368403500000000
 rabbitmq_exchange,url=http://amqp.example.org:15672,exchange=telegraf,type=fanout,vhost=influxdb,internal=false,durable=true,auto_delete=false,host=amqp.example.org messages_publish_in=2i,messages_publish_out=1i 149368403500000000
 ```

plugins/inputs/rabbitmq/rabbitmq.go

@@ -60,6 +60,12 @@ type OverviewResponse struct {
 	MessageStats *MessageStats `json:"message_stats"`
 	ObjectTotals *ObjectTotals `json:"object_totals"`
 	QueueTotals  *QueueTotals  `json:"queue_totals"`
+	Listeners    []Listeners   `json:"listeners"`
+}
+
+// Listeners ...
+type Listeners struct {
+	Protocol string `json:"protocol"`
 }
 
 // Details ...
@@ -134,6 +140,7 @@ type Node struct {
 	RunQueue      int64 `json:"run_queue"`
 	SocketsTotal  int64 `json:"sockets_total"`
 	SocketsUsed   int64 `json:"sockets_used"`
+	Running       bool  `json:"running"`
 }
 
 type Exchange struct {
@@ -275,11 +282,20 @@ func gatherOverview(r *RabbitMQ, acc telegraf.Accumulator) {
 		return
 	}
 
-	if overview.QueueTotals == nil || overview.ObjectTotals == nil || overview.MessageStats == nil {
+	if overview.QueueTotals == nil || overview.ObjectTotals == nil || overview.MessageStats == nil || overview.Listeners == nil {
 		acc.AddError(fmt.Errorf("Wrong answer from rabbitmq. Probably auth issue"))
 		return
 	}
 
+	var clustering_listeners, amqp_listeners int64 = 0, 0
+	for _, listener := range overview.Listeners {
+		if listener.Protocol == "clustering" {
+			clustering_listeners++
+		} else if listener.Protocol == "amqp" {
+			amqp_listeners++
+		}
+	}
+
 	tags := map[string]string{"url": r.URL}
 	if r.Name != "" {
 		tags["name"] = r.Name
@@ -297,6 +313,8 @@ func gatherOverview(r *RabbitMQ, acc telegraf.Accumulator) {
 		"messages_delivered":     overview.MessageStats.Deliver,
 		"messages_delivered_get": overview.MessageStats.DeliverGet,
 		"messages_published":     overview.MessageStats.Publish,
+		"clustering_listeners":   clustering_listeners,
+		"amqp_listeners":         amqp_listeners,
 	}
 	acc.AddFields("rabbitmq_overview", fields, tags)
 }
@@ -319,6 +337,11 @@ func gatherNodes(r *RabbitMQ, acc telegraf.Accumulator) {
 		tags := map[string]string{"url": r.URL}
 		tags["node"] = node.Name
 
+		var running int64 = 0
+		if node.Running {
+			running = 1
+		}
+
 		fields := map[string]interface{}{
 			"disk_free":       node.DiskFree,
 			"disk_free_limit": node.DiskFreeLimit,
@@ -331,6 +354,7 @@ func gatherNodes(r *RabbitMQ, acc telegraf.Accumulator) {
 			"run_queue":       node.RunQueue,
 			"sockets_total":   node.SocketsTotal,
 			"sockets_used":    node.SocketsUsed,
+			"running":         running,
 		}
 		acc.AddFields("rabbitmq_node", fields, tags, now)
 	}

plugins/inputs/rabbitmq/rabbitmq_test.go

@@ -51,7 +51,25 @@ const sampleOverviewResponse = `
         "messages_unacknowledged_details": {
             "rate": 0.0
         }
-    }
+    },
+    "listeners": [
+        {
+            "name": "rabbit@node-a",
+            "protocol": "amqp"
+        },
+        {
+            "name": "rabbit@node-b",
+            "protocol": "amqp"
+        },
+        {
+            "name": "rabbit@node-a",
+            "protocol": "clustering"
+        },
+        {
+            "name": "rabbit@node-b",
+            "protocol": "clustering"
+        }
+    ]
 }
 `
 
@@ -514,6 +532,8 @@ func TestRabbitMQGeneratesMetrics(t *testing.T) {
 		"consumers",
 		"exchanges",
 		"queues",
+		"clustering_listeners",
+		"amqp_listeners",
 	}
 
 	for _, metric := range intMetrics {
@@ -532,6 +552,7 @@ func TestRabbitMQGeneratesMetrics(t *testing.T) {
 		"run_queue",
 		"sockets_total",
 		"sockets_used",
+		"running",
 	}
 
 	for _, metric := range nodeIntMetrics {