Add commit latency metrics

Author: yzang2019

common/metrics/metrics.go

@@ -24,19 +24,19 @@ var (
 		MemNodeCount            metric.Float64Gauge
 	}{
 		RestartLatency: must(meter.Float64Histogram(
-			"restart_latency_seconds",
+			"restart_latency",
 			metric.WithDescription("Time taken to restart the memiavl database"),
 			metric.WithUnit("s"),
 		)),
 		SnapshotCreationLatency: must(meter.Float64Histogram(
-			"snapshot_creation_latency_seconds",
+			"snapshot_creation_latency",
 			metric.WithDescription("Time taken to create memiavl snapshot"),
 			metric.WithUnit("s"),
 		)),
 		CommitLatency: must(meter.Float64Histogram(
-			"commit_latency_seconds",
+			"commit_latency",
 			metric.WithDescription("Time taken to commit"),
-			metric.WithUnit("s"),
+			metric.WithUnit("ms"),
 		)),
 		MemNodeTotalSize: must(meter.Float64Gauge(
 			"mem_node_total_size",

sc/memiavl/db.go

@@ -457,7 +457,10 @@ func (db *DB) pruneSnapshots() {
 func (db *DB) Commit() (int64, error) {
 	db.mtx.Lock()
 	defer db.mtx.Unlock()
-
+	startTime := time.Now()
+	defer func() {
+		metrics.SeiDBMetrics.CommitLatency.Record(context.Background(), time.Since(startTime).Seconds())
+	}()
 	if db.readOnly {
 		return 0, errReadOnly
 	}