Merge pull request #16641 from ncteisen/stats

Only Print Stats if They Are Collected

test/cpp/microbenchmarks/helpers.cc

@@ -38,6 +38,7 @@ void TrackCounters::AddLabel(const grpc::string& label) {
 }
 
 void TrackCounters::AddToLabel(std::ostream& out, benchmark::State& state) {
+#ifdef GRPC_COLLECT_STATS
   grpc_stats_data stats_end;
   grpc_stats_collect(&stats_end);
   grpc_stats_data stats;
@@ -53,6 +54,7 @@ void TrackCounters::AddToLabel(std::ostream& out, benchmark::State& state) {
         << " " << grpc_stats_histogram_name[i] << "-99p:"
         << grpc_stats_histo_percentile(&stats, (grpc_stats_histograms)i, 99.0);
   }
+#endif
 #ifdef GPR_LOW_LEVEL_COUNTERS
   grpc_memory_counters counters_at_end = grpc_memory_counters_snapshot();
   out << " locks/iter:"