AzureMonitor: select plugin route from cloudname (#27273)

* AzureMonitor: select plugin route from cloudname
fixes #27243

pkg/tsdb/azuremonitor/azuremonitor-datasource.go

@@ -223,15 +223,15 @@ func (e *AzureMonitorDatasource) createRequest(ctx context.Context, dsInfo *mode
 		return nil, errors.New("Unable to find datasource plugin Azure Monitor")
 	}
 
+	cloudName := dsInfo.JsonData.Get("cloudName").MustString("azuremonitor")
 	var azureMonitorRoute *plugins.AppPluginRoute
 	for _, route := range plugin.Routes {
-		if route.Path == "azuremonitor" {
+		if route.Path == cloudName {
 			azureMonitorRoute = route
 			break
 		}
 	}
 
-	cloudName := dsInfo.JsonData.Get("cloudName").MustString("azuremonitor")
 	proxyPass := fmt.Sprintf("%s/subscriptions", cloudName)
 
 	u, err := url.Parse(dsInfo.Url)