Merge pull request #3046 from xiang90/metrics

refactor metrics

etcdserver/metrics.go

@@ -47,7 +47,7 @@ var (
 	fileDescriptorUsed = prometheus.NewGauge(prometheus.GaugeOpts{
 		Namespace: "etcd",
 		Subsystem: "server",
-		Name:      "file_descriptors_used_totol",
+		Name:      "file_descriptors_used_total",
 		Help:      "The total number of file descriptors used.",
 	})
 )

snap/metrics.go

@@ -20,8 +20,10 @@ var (
 	// TODO: save_fsync latency?
 	// TODO: save_encoding latency?
 	saveDurations = prometheus.NewSummary(prometheus.SummaryOpts{
-		Name: "snapshot_save_total_durations_microseconds",
-		Help: "The total latency distributions of save called by snapshot.",
+		Namespace: "etcd",
+		Subsystem: "snapshot",
+		Name:      "save_total_durations_microseconds",
+		Help:      "The total latency distributions of save called by snapshot.",
 	})
 )