Add commitment_count_in_gossip_processed_blocks gauge for blob KZG commitments

beacon-chain/sync/metrics.go

@@ -256,6 +256,20 @@ var (
 			Help: "Count the number of data column sidecars obtained via the execution layer.",
 		},
 	)
+
+	commitmentCount = promauto.NewGauge(
+		prometheus.GaugeOpts{
+			Name: "commitment_count_in_gossip_processed_blocks",
+			Help: "The number of blob KZG commitments in the most recently processed block.",
+		},
+	)
+
+	maxBlobsPerBlock = promauto.NewGauge(
+		prometheus.GaugeOpts{
+			Name: "max_blobs_per_block",
+			Help: "The maximum number of blobs allowed in a block.",
+		},
+	)
 )
 
 func (s *Service) updateMetrics() {

beacon-chain/sync/subscriber_beacon_blocks.go

@@ -81,6 +81,18 @@ func (s *Service) beaconBlockSubscriber(ctx context.Context, msg proto.Message)
 		return errors.Wrap(err, "process pending atts for block")
 	}
 
+	if block.Body() == nil {
+		log.Errorf("nil block body for root %#x", root)
+	}
+
+	commitments, err := block.Body().BlobKzgCommitments()
+	if err != nil {
+		return errors.Wrap(err, "blob Kzg commitments")
+	}
+
+	commitmentCount.Set(float64(len(commitments)))
+	maxBlobsPerBlock.Set(float64(params.BeaconConfig().MaxBlobsPerBlock(block.Slot())))
+
 	return nil
 }
 

changelog/manu_blob_commitment_count_metric.md

@@ -0,0 +1,2 @@
+### Added
+- `commitment_count_in_gossip_processed_blocks` gauge metric to track the number of blob KZG commitments in processed beacon blocks.