fix(loadtest): submit observed after quiet timeout

loadtest/im-pressure/agent.go

@@ -222,8 +222,12 @@ func runAgent(ctx context.Context, cfg *Config, manifest *Manifest, machine, coo
 	quietPeriod, _ := configDuration(cfg.DeliveryQuiet)
 	quietTimeout, _ := configDuration(cfg.DeliveryTimeout)
 	log.Printf("agent=%s waiting for %s of delivery quiescence", machine, quietPeriod)
-	if err = waitForDeliveryQuiescence(ctx, run.recorder, run.callbackQueue, quietPeriod, quietTimeout); err != nil {
-		return err
+	var quiescenceErr error
+	if quiescenceErr = waitForDeliveryQuiescence(ctx, run.recorder, run.callbackQueue, quietPeriod, quietTimeout); quiescenceErr != nil {
+		if ctx.Err() != nil {
+			return quiescenceErr
+		}
+		log.Printf("agent=%s delivery quiescence wait timed out; continuing with observed submission: %v", machine, quiescenceErr)
 	}
 	observedLocal := run.recorder.unackedObservedMessages(ledger, start.Scenario)
 	if err = coord.submitObserved(ctx, machine, observedLocal); err != nil {
@@ -247,6 +251,9 @@ func runAgent(ctx context.Context, cfg *Config, manifest *Manifest, machine, coo
 	run.mu.Lock()
 	base.Errors = append(base.Errors, run.errors...)
 	run.mu.Unlock()
+	if quiescenceErr != nil {
+		base.Errors = append(base.Errors, quiescenceErr.Error())
+	}
 	// Include messages observed over WebSocket without a timely ctrl ACK. They
 	// are confirmed server-side publishes and must participate in realtime
 	// delivery accounting instead of being reported as unexpected traffic.