Fix case when backend is not set

Signed-off-by: Arjun Naik <arjun.rn@gmail.com>

pkg/collector/skipper_collector.go

@@ -85,12 +85,12 @@ func getAnnotationWeight(backendWeights string, backend string) float64 {
 	var weightsMap map[string]int
 	err := json.Unmarshal([]byte(backendWeights), &weightsMap)
 	if err != nil {
-		return 0
+		return 1
 	}
 	if weight, ok := weightsMap[backend]; ok {
 		return float64(weight) / 100
 	}
-	return 0
+	return 1
 }
 
 func getWeights(ingressAnnotations map[string]string, backendAnnotations []string, backend string) float64 {

pkg/collector/skipper_collector_test.go

@@ -174,6 +174,18 @@ func TestSkipperCollector(t *testing.T) {
 			readyReplicas:      5,
 			backendAnnotations: []string{testBackendWeightsAnnotation, testStacksetWeightsAnnotation},
 		},
+		{
+			msg:                "test backend is not set",
+			metrics:            []int{100, 1500, 700},
+			ingressName:        "dummy-ingress",
+			collectedMetric:    1500,
+			namespace:          "default",
+			backend:            "",
+			backendWeights:     map[string]map[string]int{testBackendWeightsAnnotation: {"backend2": 100, "backend1": 0}},
+			replicas:           1,
+			readyReplicas:      1,
+			backendAnnotations: []string{testBackendWeightsAnnotation},
+		},
 	} {
 		t.Run(tc.msg, func(tt *testing.T) {
 			client := fake.NewSimpleClientset()