op-proposer: add l2 block height metrics

op-proposer/proposer/l2_output_submitter.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"github.com/prometheus/client_golang/prometheus"
 	"math/big"
 	_ "net/http/pprof"
 	"os"
@@ -78,17 +79,16 @@ func Main(version string, cliCtx *cli.Context) error {
 		}()
 	}
 
-	registry := opmetrics.NewRegistry()
 	metricsCfg := cfg.MetricsConfig
 	if metricsCfg.Enabled {
 		l.Info("starting metrics server", "addr", metricsCfg.ListenAddr, "port", metricsCfg.ListenPort)
 		go func() {
-			if err := opmetrics.ListenAndServe(ctx, registry, metricsCfg.ListenAddr, metricsCfg.ListenPort); err != nil {
+			if err := opmetrics.ListenAndServe(ctx, l2OutputSubmitter.metricsRegistry, metricsCfg.ListenAddr, metricsCfg.ListenPort); err != nil {
 				l.Error("error starting metrics server", err)
 			}
 		}()
 		addr := l2OutputSubmitter.from
-		opmetrics.LaunchBalanceMetrics(ctx, l, registry, "", l2OutputSubmitter.l1Client, addr)
+		opmetrics.LaunchBalanceMetrics(ctx, l, l2OutputSubmitter.metricsRegistry, "", l2OutputSubmitter.l1Client, addr)
 	}
 
 	rpcCfg := cfg.RPCConfig
@@ -117,6 +117,7 @@ type L2OutputSubmitter struct {
 	wg              sync.WaitGroup
 	done            chan struct{}
 	log             log.Logger
+	metricsRegistry *prometheus.Registry
 
 	ctx    context.Context
 	cancel context.CancelFunc
@@ -226,6 +227,7 @@ func NewL2OutputSubmitter(cfg Config, l log.Logger) (*L2OutputSubmitter, error)
 		txMgr:           txmgr.NewSimpleTxManager("proposer", l, cfg.TxManagerConfig, cfg.L1Client),
 		done:            make(chan struct{}),
 		log:             l,
+		metricsRegistry: opmetrics.NewRegistry(),
 		ctx:             ctx,
 		cancel:          cancel,
 
@@ -375,6 +377,9 @@ func (l *L2OutputSubmitter) SendTransaction(ctx context.Context, tx *types.Trans
 		return err
 	}
 
+	// Emit the proposed block Number
+	opmetrics.EmitBlockNumber(l.metricsRegistry, "", receipt.BlockNumber)
+
 	// The transaction was successfully submitted
 	l.log.Info("proposer tx successfully published", "tx_hash", receipt.TxHash)
 	return nil

op-service/metrics/block.go

+package metrics
+
+import (
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"math/big"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+func EmitBlockNumber(r *prometheus.Registry, ns string, blockNumber *big.Int) {
+	promauto.With(r).NewGauge(prometheus.GaugeOpts{
+		Namespace: ns,
+		Name:      "latest_block_number",
+		Help:      "Latest L2 proposed block number",
+	}).Set(float64(blockNumber.Uint64()))
+}