diff --git a/pkg/pgmodel/ingestor/metric_batcher.go b/pkg/pgmodel/ingestor/metric_batcher.go
index 29c98e9adc..ef203fa8c5 100644
--- a/pkg/pgmodel/ingestor/metric_batcher.go
+++ b/pkg/pgmodel/ingestor/metric_batcher.go
@@ -256,7 +256,7 @@ func sendBatches(firstReq *insertDataRequest, input chan *insertDataRequest, con
 
 		numSeries := pending.batch.CountSeries()
 		numSamples, numExemplars := pending.batch.Count()
-
+		wasFull := pending.IsFull()
 		select {
 		//try to batch as much as possible before sending
 		case req, ok := <-recvCh:
@@ -277,7 +277,7 @@ func sendBatches(firstReq *insertDataRequest, input chan *insertDataRequest, con
 			metrics.IngestorFlushSeries.With(prometheus.Labels{"type": "metric", "subsystem": "metric_batcher"}).Observe(float64(numSeries))
 			metrics.IngestorFlushInsertables.With(prometheus.Labels{"type": "metric", "subsystem": "metric_batcher"}).Observe(float64(numSamples + numExemplars))
 			metrics.IngestorBatchDuration.With(prometheus.Labels{"type": "metric", "subsystem": "metric_batcher"}).Observe(time.Since(pending.Start).Seconds())
-			if pending.IsFull() {
+			if wasFull {
 				metrics.IngestorBatchFlushTotal.With(prometheus.Labels{"type": "metric", "subsystem": "metric_batcher", "reason": "size"}).Inc()
 			} else {
 				metrics.IngestorBatchFlushTotal.With(prometheus.Labels{"type": "metric", "subsystem": "metric_batcher", "reason": "requested"}).Inc()