backend: more metrics for bboltdb transcation

mvcc/backend/batch_tx.go

@@ -220,6 +220,9 @@ func (t *batchTx) commit(stop bool) {
 		err := t.tx.Commit()
 		// gofail: var afterCommit struct{}
 
+		rebalanceSec.Observe(t.tx.Stats().RebalanceTime.Seconds())
+		spillSec.Observe(t.tx.Stats().SpillTime.Seconds())
+		writeSec.Observe(t.tx.Stats().WriteTime.Seconds())
 		commitSec.Observe(time.Since(start).Seconds())
 		atomic.AddInt64(&t.backend.commits, 1)
 

mvcc/backend/metrics.go

@@ -28,6 +28,39 @@ var (
 		Buckets: prometheus.ExponentialBuckets(0.001, 2, 14),
 	})
 
+	rebalanceSec = prometheus.NewHistogram(prometheus.HistogramOpts{
+		Namespace: "etcd_debugging",
+		Subsystem: "disk",
+		Name:      "backend_rebalance_duration_seconds",
+		Help:      "The latency distributions of commit.rebalance called by bboltdb backend.",
+
+		// lowest bucket start of upper bound 0.001 sec (1 ms) with factor 2
+		// highest bucket start of 0.001 sec * 2^13 == 8.192 sec
+		Buckets: prometheus.ExponentialBuckets(0.001, 2, 14),
+	})
+
+	spillSec = prometheus.NewHistogram(prometheus.HistogramOpts{
+		Namespace: "etcd_debugging",
+		Subsystem: "disk",
+		Name:      "backend_commit_duration_seconds",
+		Help:      "The latency distributions of commit.spill called by bboltdb backend.",
+
+		// lowest bucket start of upper bound 0.001 sec (1 ms) with factor 2
+		// highest bucket start of 0.001 sec * 2^13 == 8.192 sec
+		Buckets: prometheus.ExponentialBuckets(0.001, 2, 14),
+	})
+
+	writeSec = prometheus.NewHistogram(prometheus.HistogramOpts{
+		Namespace: "etcd_debugging",
+		Subsystem: "disk",
+		Name:      "backend_commit_duration_seconds",
+		Help:      "The latency distributions of commit.write called by bboltdb backend.",
+
+		// lowest bucket start of upper bound 0.001 sec (1 ms) with factor 2
+		// highest bucket start of 0.001 sec * 2^13 == 8.192 sec
+		Buckets: prometheus.ExponentialBuckets(0.001, 2, 14),
+	})
+
 	defragSec = prometheus.NewHistogram(prometheus.HistogramOpts{
 		Namespace: "etcd",
 		Subsystem: "disk",