Alerting: take datasources as external alertmanagers into consideration (#52534)

pkg/services/ngalert/api/api.go

@@ -62,6 +62,7 @@ type AlertingStore interface {
 type API struct {
 	Cfg                  *setting.Cfg
 	DatasourceCache      datasources.CacheService
+	DatasourceService    datasources.DataSourceService
 	RouteRegister        routing.RouteRegister
 	ExpressionService    *expr.Service
 	QuotaService         quota.Service
@@ -130,6 +131,7 @@ func (api *API) RegisterAPIEndpoints(m *metrics.API) {
 		}), m)
 	api.RegisterConfigurationApiEndpoints(NewConfiguration(
 		&ConfigSrv{
+			datasourceService:    api.DatasourceService,
 			store:                api.AdminConfigStore,
 			log:                  logger,
 			alertmanagerProvider: api.AlertsRouter,