feat(api): expose all receivers in the API response

cmd/karma/api_test.go

@@ -1082,6 +1082,11 @@ func TestVerifyAllGroups(t *testing.T) {
 		if !reflect.DeepEqual(ur.Filters, filtersExpected) {
 			t.Errorf("[%s] Filters mismatch, expected %v but got %v", version, filtersExpected, ur.Filters)
 		}
+
+		expectedReceivers := []string{"by-cluster-service", "by-name"}
+		if diff := cmp.Diff(expectedReceivers, ur.Receivers); diff != "" {
+			t.Errorf("Incorrect receivers list (-want +got):\n%s", diff)
+		}
 	}
 }
 

cmd/karma/views.go

@@ -223,12 +223,17 @@ func alerts(c *gin.Context) {
 		}
 	}
 
+	allReceivers := map[string]bool{}
+
 	var matches int
 	for _, ag := range dedupedAlerts {
 		perGridAlertGroup := map[string]*models.AlertGroup{}
 
 		for _, alert := range ag.Alerts {
 			alert := alert // scopelint pin
+
+			allReceivers[alert.Receiver] = true
+
 			results := []bool{}
 			if validFilters {
 				for _, filter := range matchFilters {
@@ -370,11 +375,19 @@ func alerts(c *gin.Context) {
 	v, _ := c.GetQuery("gridSortReverse")
 	gridSortReverse := v == "1"
 
+	receivers := []string{}
+	for k := range allReceivers {
+		k := k
+		receivers = append(receivers, k)
+	}
+	sort.Strings(receivers)
+
 	resp.Grids = sortGrids(c, gridLabel, grids, gridSortReverse)
 	resp.Silences = silences
 	resp.Colors = colors
 	resp.Counters = countersToLabelStats(counters)
 	resp.Filters = populateAPIFilters(matchFilters)
+	resp.Receivers = receivers
 
 	data, err := json.Marshal(resp)
 	if err != nil {

internal/models/api.go

@@ -321,6 +321,7 @@ type AlertsResponse struct {
 	Counters       LabelNameStatsList            `json:"counters"`
 	Settings       Settings                      `json:"settings"`
 	Authentication AuthenticationInfo            `json:"authentication"`
+	Receivers      []string                      `json:"receivers"`
 }
 
 // Autocomplete is the structure of autocomplete object for filter hints