diff --git a/eth/downloader/metrics.go b/eth/downloader/metrics.go
index 608b39828b..4965f4d0c8 100644
--- a/eth/downloader/metrics.go
+++ b/eth/downloader/metrics.go
@@ -38,5 +38,6 @@ var (
 	receiptDropMeter    = metrics.NewRegisteredMeter("eth/downloader/receipts/drop", nil)
 	receiptTimeoutMeter = metrics.NewRegisteredMeter("eth/downloader/receipts/timeout", nil)
 
-	throttleCounter = metrics.NewRegisteredCounter("eth/downloader/throttle", nil)
+	throttleCounter        = metrics.NewRegisteredCounter("eth/downloader/throttle", nil)
+	blockGasSizeRatioGauge = metrics.NewRegisteredGaugeFloat64("eth/downloader/gassizeratio", nil)
 )
diff --git a/eth/downloader/queue.go b/eth/downloader/queue.go
index 8a117f1f7d..9b93c1c7f7 100644
--- a/eth/downloader/queue.go
+++ b/eth/downloader/queue.go
@@ -333,6 +333,7 @@ func (q *queue) Results(block bool) []*fetchResult {
 			(1-common.StorageSize(blockCacheSizeWeight))*q.resultGasSizeRatio
 	}
 	throttleThreshold := q.resultCache.SetThrottleTarget(q.resultGasSizeRatio)
+	blockGasSizeRatioGauge.Update(float64(q.resultGasSizeRatio))
 
 	// With results removed from the cache, wake throttled fetchers
 	for _, ch := range []chan bool{q.blockWakeCh, q.receiptWakeCh} {