diff --git a/test/upgrade/prober/wathola/event/services.go b/test/upgrade/prober/wathola/event/services.go
index c5717810af6..f7f055b4ce9 100644
--- a/test/upgrade/prober/wathola/event/services.go
+++ b/test/upgrade/prober/wathola/event/services.go
@@ -108,7 +108,11 @@ func (f *finishedStore) RegisterFinished(finished *Finished) {
 	log.Infof("waiting additional %v to be sure all events came", d)
 	time.Sleep(d)
 	receivedEvents := f.steps.Count()
-	if receivedEvents != finished.EventsSent {
+
+	if receivedEvents != finished.EventsSent &&
+		// If sending was interrupted, tolerate one more received
+		// event as there's no way to check if the last event is delivered or not.
+		!(finished.SendingInterrupted && receivedEvents == finished.EventsSent+1) {
 		f.errors.throwUnexpected("expecting to have %v unique events received, "+
 			"but received %v unique events", finished.EventsSent, receivedEvents)
 		f.reportViolations(finished)
diff --git a/test/upgrade/prober/wathola/event/types.go b/test/upgrade/prober/wathola/event/types.go
index 3cab3915991..d53284ba420 100644
--- a/test/upgrade/prober/wathola/event/types.go
+++ b/test/upgrade/prober/wathola/event/types.go
@@ -46,6 +46,7 @@ type Finished struct {
 	EventsSent         int
 	TotalRequests      int
 	UnavailablePeriods []UnavailablePeriod
+	SendingInterrupted bool
 }
 
 // Type returns a type of a event
diff --git a/test/upgrade/prober/wathola/sender/services.go b/test/upgrade/prober/wathola/sender/services.go
index 7827e12ad2a..38ace276c73 100644
--- a/test/upgrade/prober/wathola/sender/services.go
+++ b/test/upgrade/prober/wathola/sender/services.go
@@ -58,6 +58,8 @@ type sender struct {
 	totalRequests int
 	// unavailablePeriods is an array for non-zero retries for each event
 	unavailablePeriods []event.UnavailablePeriod
+	// sendingInterrupted indicates whether sending last event was interrupted by shutdown
+	sendingInterrupted bool
 }
 
 func (s *sender) SendContinually() {
@@ -90,6 +92,7 @@ func (s *sender) SendContinually() {
 					Period:  time.Since(start),
 					LastErr: err.Error(),
 				})
+				s.sendingInterrupted = true
 			}
 			return
 		default:
@@ -100,7 +103,7 @@ func (s *sender) SendContinually() {
 				start = time.Now()
 			}
 			log.Warnf("Could not send step event %v, retrying (%d): %v",
-				s.eventsSent, retry, err)
+				currentStep.Number, retry, err)
 			retry++
 			lastErr = err
 		} else {
@@ -219,7 +222,12 @@ func (s *sender) sendFinished() {
 	if s.eventsSent == 0 {
 		return
 	}
-	finished := event.Finished{EventsSent: s.eventsSent, TotalRequests: s.totalRequests, UnavailablePeriods: s.unavailablePeriods}
+	finished := event.Finished{
+		EventsSent:         s.eventsSent,
+		TotalRequests:      s.totalRequests,
+		UnavailablePeriods: s.unavailablePeriods,
+		SendingInterrupted: s.sendingInterrupted,
+	}
 	endpoint := senderConfig.Address
 	ce := NewCloudEvent(finished, event.FinishedType)
 	ctx, span := PopulateSpanWithEvent(context.Background(), ce, Name)