add block sync metrics (backport from main)

blocksync/metrics.go

@@ -0,0 +1,36 @@
+package blocksync
+
+import (
+	"github.com/go-kit/kit/metrics"
+
+	"github.com/cometbft/cometbft/types"
+)
+
+const (
+	// MetricsSubsystem is a subsystem shared by all metrics exposed by this
+	// package.
+	MetricsSubsystem = "blocksync"
+)
+
+//go:generate go run ../scripts/metricsgen -struct=Metrics
+
+// Metrics contains metrics exposed by this package.
+type Metrics struct {
+	// Whether or not a node is block syncing. 1 if yes, 0 if no.
+	Syncing metrics.Gauge
+	// Number of transactions in the latest block.
+	NumTxs metrics.Gauge
+	// Total number of transactions.
+	TotalTxs metrics.Gauge
+	// Size of the latest block.
+	BlockSizeBytes metrics.Gauge
+	// The height of the latest block.
+	LatestBlockHeight metrics.Gauge
+}
+
+func (m *Metrics) recordBlockMetrics(block *types.Block) {
+	m.NumTxs.Set(float64(len(block.Data.Txs)))
+	m.TotalTxs.Add(float64(len(block.Data.Txs)))
+	m.BlockSizeBytes.Set(float64(block.Size()))
+	m.LatestBlockHeight.Set(float64(block.Height))
+}