[connector/spanmetricsv2] Fix allocation logic (#70)

Author: lahsivjar

connector/spanmetricsconnectorv2/connector.go

@@ -73,7 +73,6 @@ func (sm *spanMetrics) ConsumeTraces(ctx context.Context, td ptrace.Traces) erro
 		processedResource := processedMetrics.ResourceMetrics().AppendEmpty()
 		resourceSpan.Resource().Attributes().CopyTo(processedResource.Resource().Attributes())
 
-		processedResource.ScopeMetrics().EnsureCapacity(resourceSpan.ScopeSpans().Len())
 		processedScope := processedResource.ScopeMetrics().AppendEmpty()
 		processedScope.Scope().SetName(scopeName)
 

connector/spanmetricsconnectorv2/histogram.go

@@ -131,6 +131,13 @@ func (c *explicitHistogram) increment(
 }
 
 func (c *explicitHistogram) appendMetricsTo(metricSlice pmetric.MetricSlice) {
+	var capacity int
+	for name := range c.metricDefs {
+		if len(c.counts[name]) > 0 {
+			capacity++
+		}
+	}
+	metricSlice.EnsureCapacity(capacity)
 	for name, md := range c.metricDefs {
 		if len(c.counts[name]) == 0 {
 			continue