Add HTTP metrics and TCP

README.md

@@ -223,10 +223,14 @@ Further Information
 | elasticsearch_thread_pool_queue_count                                 | gauge     | 14          | Thread Pool operations queued
 | elasticsearch_thread_pool_rejected_count                              | counter   | 14          | Thread Pool operations rejected
 | elasticsearch_thread_pool_threads_count                               | gauge     | 14          | Thread Pool current threads count
+| elasticsearch_transport_tcp_connections_open_current                  | gauge     | 1           | Number of connections opened for cluster communication
+| elasticsearch_transport_outbound_connections_total                    | counter   | 1           | Total number of outbound transport connections
 | elasticsearch_transport_rx_packets_total                              | counter   | 1           | Count of packets received
 | elasticsearch_transport_rx_size_bytes_total                           | counter   | 1           | Total number of bytes received
 | elasticsearch_transport_tx_packets_total                              | counter   | 1           | Count of packets sent
 | elasticsearch_transport_tx_size_bytes_total                           | counter   | 1           | Total number of bytes sent
+| elasticsearch_http_connections_opened_current                         | gauge     | 1           | Current number of opened connections
+| elasticsearch_http_connections_opened_total                           | counter   | 1           | Total number of opened connections
 | elasticsearch_clusterinfo_last_retrieval_success_ts                   | gauge     | 1           | Timestamp of the last successful cluster info retrieval
 | elasticsearch_clusterinfo_up                                          | gauge     | 1           | Up metric for the cluster info collector
 | elasticsearch_clusterinfo_version_info                                | gauge     | 6           | Constant metric with ES version information as labels

collector/nodes.go

@@ -56,7 +56,7 @@ func getRoles(node NodeStatsNodeResponse) map[string]bool {
 			}
 		}
 	}
-	if len(node.HTTP) == 0 {
+	if node.HTTP == nil {
 		roles["client"] = false
 	}
 	return roles
@@ -1462,6 +1462,30 @@ func NewNodes(logger log.Logger, client *http.Client, url *url.URL, all bool, no
 					return defaultNodeLabelValues(cluster, node)
 				},
 			},
+			{
+				Type: prometheus.GaugeValue,
+				Desc: prometheus.NewDesc(
+					prometheus.BuildFQName(namespace, "transport", "tcp_connections_open_current"),
+					"Current number of connections open for cluster communication",
+					defaultNodeLabels, nil,
+				),
+				Value: func(node NodeStatsNodeResponse) float64 {
+					return float64(node.Transport.ServerOpen)
+				},
+				Labels: defaultNodeLabelValues,
+			},
+			{
+				Type: prometheus.CounterValue,
+				Desc: prometheus.NewDesc(
+					prometheus.BuildFQName(namespace, "transport", "outbound_connections_total"),
+					"Count of outbound transport connections",
+					defaultNodeLabels, nil,
+				),
+				Value: func(node NodeStatsNodeResponse) float64 {
+					return float64(node.Transport.OutboundConn)
+				},
+				Labels: defaultNodeLabelValues,
+			},
 			{
 				Type: prometheus.CounterValue,
 				Desc: prometheus.NewDesc(
@@ -1510,6 +1534,30 @@ func NewNodes(logger log.Logger, client *http.Client, url *url.URL, all bool, no
 				},
 				Labels: defaultNodeLabelValues,
 			},
+			{
+				Type: prometheus.GaugeValue,
+				Desc: prometheus.NewDesc(
+					prometheus.BuildFQName(namespace, "http", "connections_opened_current"),
+					"Current number of open HTTP connections",
+					defaultNodeLabels, nil,
+				),
+				Value: func(node NodeStatsNodeResponse) float64 {
+					return float64(node.HTTP.CurrentOpen)
+				},
+				Labels: defaultNodeLabelValues,
+			},
+			{
+				Type: prometheus.CounterValue,
+				Desc: prometheus.NewDesc(
+					prometheus.BuildFQName(namespace, "http", "connections_opened_total"),
+					"Total number of HTTP connections opened ",
+					defaultNodeLabels, nil,
+				),
+				Value: func(node NodeStatsNodeResponse) float64 {
+					return float64(node.HTTP.TotalOpen)
+				},
+				Labels: defaultNodeLabelValues,
+			},
 		},
 		gcCollectionMetrics: []*gcCollectionMetric{
 			{

collector/nodes_response.go

@@ -37,7 +37,7 @@ type NodeStatsNodeResponse struct {
 	ThreadPool       map[string]NodeStatsThreadPoolPoolResponse `json:"thread_pool"`
 	JVM              NodeStatsJVMResponse                       `json:"jvm"`
 	Breakers         map[string]NodeStatsBreakersResponse       `json:"breakers"`
-	HTTP             map[string]interface{}                     `json:"http"`
+	HTTP             *NodeStatsHTTPResponse                     `json:"http"`
 	Transport        NodeStatsTransportResponse                 `json:"transport"`
 	Process          NodeStatsProcessResponse                   `json:"process"`
 }
@@ -101,11 +101,12 @@ type NodeStatsNetworkResponse struct {
 
 // NodeStatsTransportResponse is a representation of a transport statistics about sent and received bytes in cluster communication
 type NodeStatsTransportResponse struct {
-	ServerOpen int64 `json:"server_open"`
-	RxCount    int64 `json:"rx_count"`
-	RxSize     int64 `json:"rx_size_in_bytes"`
-	TxCount    int64 `json:"tx_count"`
-	TxSize     int64 `json:"tx_size_in_bytes"`
+	ServerOpen   int64 `json:"server_open"`
+	OutboundConn int64 `json:"total_outbound_connections"`
+	RxCount      int64 `json:"rx_count"`
+	RxSize       int64 `json:"rx_size_in_bytes"`
+	TxCount      int64 `json:"tx_count"`
+	TxSize       int64 `json:"tx_size_in_bytes"`
 }
 
 // NodeStatsThreadPoolPoolResponse is a representation of a statistics about each thread pool, including current size, queue and rejected tasks
@@ -333,7 +334,7 @@ type NodeStatsProcessCPUResponse struct {
 // NodeStatsHTTPResponse defines node stats HTTP connections structure
 type NodeStatsHTTPResponse struct {
 	CurrentOpen int64 `json:"current_open"`
-	TotalOpen   int64 `json:"total_open"`
+	TotalOpen   int64 `json:"total_opened"`
 }
 
 // NodeStatsFSResponse is a representation of a file system information, data path, free disk space, read/write stats