fix: remove duplicate service detection for distributor

pkg/distributor/distributor.go

@@ -787,22 +787,6 @@ func (d *Distributor) parseStreamLabels(vContext validationContext, key string,
 		return nil, "", 0, err
 	}
 
-	// We do not want to count service_name added by us in the stream limit so adding it after validating original labels.
-	// We also don't want to add service name to aggregated metrics.
-	if !ls.Has(push.LabelServiceName) && !ls.Has(push.AggregatedMetricLabel) &&
-		len(vContext.discoverServiceName) > 0 {
-		serviceName := push.ServiceUnknown
-		for _, labelName := range vContext.discoverServiceName {
-			if labelVal := ls.Get(labelName); labelVal != "" {
-				serviceName = labelVal
-				break
-			}
-		}
-
-		ls = labels.NewBuilder(ls).Set(push.LabelServiceName, serviceName).Labels()
-		stream.Labels = ls.String()
-	}
-
 	lsHash := ls.Hash()
 
 	d.labelCache.Add(key, labelData{ls, lsHash})