fix: aggregate per-worker counters in loadgen-grpc status/logs

loadgen/cmd/grpc/main.go

@@ -123,14 +123,29 @@ func main() {
 		select {
 		case <-ctx.Done():
 			wg.Wait()
-			printFinal(logger, &sent, &failed, &dupes, &rlHits, &rttHist)
+			var tsent, tfailed, tdupes, trlHits uint64
+	for i := range results {
+		tsent += results[i].sent
+		tfailed += results[i].failed
+		tdupes += results[i].dupes
+		trlHits += results[i].rlHits
+	}
+	printFinal(logger, tsent, tfailed, tdupes, trlHits, &rttHist)
 			return
 		case <-ticker.C:
+			// Aggregate per-worker counters.
+			var tsent, tfailed, tdupes, trlHits uint64
+			for i := range results {
+				tsent += results[i].sent
+				tfailed += results[i].failed
+				tdupes += results[i].dupes
+				trlHits += results[i].rlHits
+			}
 			logger.Info("progress",
-				"sent", sent.Load(),
-				"failed", failed.Load(),
-				"dupes", dupes.Load(),
-				"rate_limited", rlHits.Load(),
+				"sent", tsent,
+				"failed", tfailed,
+				"dupes", tdupes,
+				"rate_limited", trlHits,
 			)
 		}
 	}
@@ -396,12 +411,12 @@ func runMetrics(addr, clusterID, instance string, sent, failed, dupes, rlHits *a
 	_ = srv.ListenAndServe()
 }
 
-func printFinal(logger *slog.Logger, sent, failed, dupes, rlHits *atomic.Uint64, rttHist *atomicHistogram) {
+func printFinal(logger *slog.Logger, sent, failed, dupes, rlHits uint64, rttHist *atomicHistogram) {
 	logger.Info("done",
-		"sent", sent.Load(),
-		"failed", failed.Load(),
-		"dupes", dupes.Load(),
-		"rate_limited", rlHits.Load(),
+		"sent", sent,
+		"failed", failed,
+		"dupes", dupes,
+		"rate_limited", rlHits,
 		"rtt", rttHist.String(),
 	)
 }