work around log lib inefficiencies #123

see
raintank/grafana@508cc44
grafana/grafana#4055

Author: Dieterbe

metric_tank/metric_tank.go

@@ -128,6 +128,23 @@ func main() {
 	}
 
 	log.NewLogger(0, "console", fmt.Sprintf(`{"level": %d, "formatting":true}`, *logLevel))
+	// workaround for https://github.com/grafana/grafana/issues/4055
+	switch *logLevel {
+	case 0:
+		log.Level(log.TRACE)
+	case 1:
+		log.Level(log.DEBUG)
+	case 2:
+		log.Level(log.INFO)
+	case 3:
+		log.Level(log.WARN)
+	case 4:
+		log.Level(log.ERROR)
+	case 5:
+		log.Level(log.CRITICAL)
+	case 6:
+		log.Level(log.FATAL)
+	}
 
 	if *showVersion {
 		fmt.Println("metrics_tank")