label name is statusCode

weed/stats/metrics.go

@@ -99,7 +99,7 @@ var (
 			Subsystem: "s3",
 			Name:      "request_total",
 			Help:      "Counter of s3 requests.",
-		}, []string{"type", "code"})
+		}, []string{"type", "statusCode"})
 	S3RequestHistogram = prometheus.NewHistogramVec(
 		prometheus.HistogramOpts{
 			Namespace: "SeaweedFS",