feat(da): submitted batch size metric (#1020)

block/submit.go

@@ -153,7 +153,8 @@ func (m *Manager) CreateAndSubmitBatch(maxSizeBytes uint64) (*types.Batch, error
 		return nil, fmt.Errorf("create batch: %w", err)
 	}
 
-	m.logger.Info("Created batch.", "start height", startHeight, "end height", endHeightInclusive)
+	m.logger.Info("Created batch.", "start height", startHeight, "end height", endHeightInclusive, "size", b.SizeBytes())
+	types.LastBatchSubmittedBytes.Set(float64(b.SizeBytes()))
 
 	if err := m.SubmitBatch(b); err != nil {
 		return nil, fmt.Errorf("submit batch: %w", err)

types/metrics.go

@@ -35,6 +35,11 @@ var RollappPendingSubmissionsSkewNumBytes = promauto.NewGauge(prometheus.GaugeOp
 	Help: "The number of bytes (of blocks and commits) which have been accumulated but not yet submitted.",
 })
 
+var LastBatchSubmittedBytes = promauto.NewGauge(prometheus.GaugeOpts{
+	Name: "last_batch_submitted_bytes",
+	Help: "The size in bytes of the last batch submitted to DA.",
+})
+
 var LastReceivedP2PHeightGauge = promauto.NewGauge(prometheus.GaugeOpts{
 	Name: "last_received_p2p_height",
 	Help: "The height of the last block received from P2P.",