Add a bit of sanity to the stream health messages

metrics/healthOverview.go

@@ -13,6 +13,7 @@ import (
 const (
 	healthyPercentageValue   = 75
 	maxCPUUsage              = 90
+	minClientCountForDetails = 3
 )
 
 // GetStreamHealthOverview will return the stream health overview.
@@ -37,9 +38,10 @@ func generateStreamHealthOverview() {
 
 	// Determine what percentage of total players are represented in our overview.
 	totalPlayerCount := len(core.GetActiveViewers())
+	if totalPlayerCount > 0 && len(windowedBandwidths) > 0 {
 		representation := utils.IntPercentage(len(windowedBandwidths), totalPlayerCount)
 		overview.Representation = representation
-
+	}
 	metrics.streamHealthOverview = overview
 }
 
@@ -152,8 +154,15 @@ func errorCountHealthOverview() *models.StreamHealthOverview {
 		return nil
 	}
 
-	healthyPercentage := 100 - utils.IntPercentage(clientsWithErrors, totalNumberOfClients)
-	message := fmt.Sprintf("%d of %d clients (%d%%) are experiencing different, unspecified, playback issues.", clientsWithErrors, totalNumberOfClients, healthyPercentage)
+	// Only return these detailed values and messages if we feel we have enough
+	// clients to be able to make a reasonable assessment. This is an arbitrary
+	// number but 1 out of 1 isn't helpful.
+	message := ""
+	healthyPercentage := 0
+
+	if totalNumberOfClients >= minClientCountForDetails {
+		healthyPercentage := utils.IntPercentage(clientsWithErrors, totalNumberOfClients)
+		message = fmt.Sprintf("%d of %d clients (%d%%) may be experiencing some issues.", clientsWithErrors, totalNumberOfClients, healthyPercentage)
 
 		isUsingPassthrough := false
 		outputVariants := data.GetStreamOutputVariants()
@@ -166,6 +175,8 @@ func errorCountHealthOverview() *models.StreamHealthOverview {
 		if isUsingPassthrough {
 			message = fmt.Sprintf("%d of %d clients (%d%%) are experiencing errors. You're currently using a video passthrough output, often known for causing playback issues for people. It is suggested you turn it off.", clientsWithErrors, totalNumberOfClients, healthyPercentage)
 		}
+	}
+
 	return &models.StreamHealthOverview{
 		Healthy:           healthyPercentage > healthyPercentageValue,
 		Message:           message,

utils/utils_test.go

@@ -30,3 +30,14 @@ func TestGetHashtagsFromText(t *testing.T) {
 		t.Error("Incorrect hashtags fetched from text.")
 	}
 }
+
+func TestPercentageUtilsTest(t *testing.T) {
+	total := 42
+	number := 18
+
+	percent := IntPercentage(number, total)
+
+	if percent != 42 {
+		t.Error("Incorrect percentage calculation.")
+	}
+}