Restore +2 when reserve space for vector.

Signed-off-by: owent <admin@owent.net>
open-telemetry · Oct 3, 2023 · 0149d5c · 0149d5c
1 parent b6ca2f2
commit 0149d5c
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/exporters/prometheus/src/exporter_utils.cc b/exporters/prometheus/src/exporter_utils.cc
@@ -381,7 +381,7 @@ void PrometheusExporterUtils::SetMetricBasic(
   // Note that attribute keys are sorted, but sanitized keys can be out-of-order.
   // We could sort the sanitized keys again, but this seems too expensive to do
   // in this hot code path. Instead, we ignore out-of-order keys and emit a warning.
-  metric.label.reserve(labels.size());
+  metric.label.reserve(labels.size() + 2);
   std::string previous_key;
   for (auto const &label : labels)
   {