feat(api): expose total alerts counter in the api response

internal/models/api.go

@@ -35,6 +35,7 @@ type AlertsResponse struct {
 	Version     string                 `json:"version"`
 	Upstreams   AlertmanagerAPISummary `json:"upstreams"`
 	AlertGroups map[string]AlertGroup  `json:"groups"`
+	TotalAlerts int                    `json:"totalAlerts"`
 	Colors      LabelsColorMap         `json:"colors"`
 	Filters     []Filter               `json:"filters"`
 	Counters    LabelsCountMap         `json:"counters"`

views.go

@@ -165,6 +165,7 @@ func alerts(c *gin.Context) {
 		if len(agCopy.Alerts) > 0 {
 			agCopy.Hash = agCopy.ContentFingerprint()
 			alerts[agCopy.ID] = agCopy
+			resp.TotalAlerts += len(agCopy.Alerts)
 		}
 
 	}