metrix exporter를 프로세스 단위로 내림

client/operation.go

@@ -269,6 +269,9 @@ func (hc *houstonClient) launch(meta *procmeta) error {
 			}
 		}()
 
+		metricExporter := metric.NewPrometheusExport(hc.config.MetricNamespace)
+		defer metricExporter.Shutdown()
+
 		for {
 			buff, err := reader.ReadBytes('\n')
 			if err != nil {
@@ -289,16 +292,22 @@ func (hc *houstonClient) launch(meta *procmeta) error {
 
 					metricBuffer = metricBuffer[:len(metricBuffer)-2]
 					if metricBuffer[0] == '{' {
-						var metric metric.MetricDescription
-						if err := json.Unmarshal(metricBuffer, &metric); err != nil {
+						var desc metric.MetricDescription
+						if err := json.Unmarshal(metricBuffer, &desc); err != nil {
 							logger.Println("unmarshal metric failed :", err, string(metricBuffer))
 							continue
 						}
+						if index != 0 {
+							if desc.ConstLabels == nil {
+								desc.ConstLabels = make(map[string]string)
+							}
+							desc.ConstLabels["index"] = fmt.Sprintf("%d", index)
+						}
 
-						hc.metricExporter.RegisterMetric(&metric)
+						metricExporter.RegisterMetric(&desc)
 					} else {
 						key, val := metric.ReadMetricValue(metricBuffer)
-						hc.metricExporter.UpdateMetric(key, val)
+						metricExporter.UpdateMetric(key, val)
 					}
 
 					metricBuffer = metricBuffer[:0]