Fix: アクティビティモニタが空の場合のavg算出処理誤りを修正

resources.go

@@ -66,7 +66,10 @@ func (r *Resource) toMetrics() map[string]interface{} {
 		log.Printf("%s zone:%s %s %s:%f time:%s", r.Name, r.Zone, strInfo, r.Label, p.Value, p.Time.String())
 	}
 
-	avg := sum / float64(len(r.Monitors))
+	avg := 0.
+	if len(r.Monitors) > 0 && len(monitors) > 0 {
+		avg = sum / float64(len(r.Monitors))
+	}
 	log.Printf("%s average_%s:%f", r.Name, r.Label, avg)
 
 	metrics := map[string]interface{}{

resources_test.go

@@ -51,6 +51,37 @@ func TestResources_Metrics(t *testing.T) {
 				"label": []interface{}{},
 			},
 		},
+		{
+			name: "single resource - no value",
+			args: args{
+				resources: &Resources{
+					Label: "routers",
+					Resources: []*Resource{
+						{
+							ID:             1,
+							Name:           "test1",
+							Zone:           "is1a",
+							Monitors:       nil,
+							Label:          "traffic",
+							AdditionalInfo: nil,
+						},
+					},
+				},
+			},
+			want: map[string]interface{}{
+				"avg": 0.,
+				"max": 0.,
+				"min": 0.,
+				"routers": []interface{}{
+					map[string]interface{}{
+						"name":     "test1",
+						"zone":     "is1a",
+						"avg":      0.,
+						"monitors": []interface{}{},
+					},
+				},
+			},
+		},
 		{
 			name: "single resource - single value",
 			args: args{