fix /upstream/targets/active api

To reduce confusion, the /upstreams/:upstream_name_or_id/targets/ has been updated to not show the full list of Targets anymore, but only the ones that are currently active in the load balancer. To retrieve the full history of Targets, you can now query /upstreams/:upstream_name_or_id/targets/all. The /upstreams/:upstream_name_or_id/targets/active endpoint has been removed. Thanks @hbagdi for tackling this backlog item! Kong/kong#3049

src/js/controllers/targets.js

@@ -1,10 +1,14 @@
-angular.module('app').controller("TargetsController", ["$scope", "Kong", "$routeParams", "upstream", function ($scope, Kong, $routeParams, upstream) {
+angular.module('app').controller("TargetsController", ["$scope", "Kong", "$routeParams", "upstream",'env', function ($scope, Kong, $routeParams, upstream, env) {
   $scope.targets = [];
   $scope.total = null;
   $scope.offset = null;
   $scope.searchResults = {};
   $scope.searching = false;
   $scope.upstream = upstream;
+
+  //To reduce confusion, the /upstreams/:upstream_name_or_id/targets/ has been updated to not show the full list of Targets anymore, but only the ones that are currently active in the load balancer. 
+  //To retrieve the full history of Targets, you can now query /upstreams/:upstream_name_or_id/targets/all. The /upstreams/:upstream_name_or_id/targets/active endpoint has been removed. 
+  //https://github.com/Kong/kong/pull/3049
   $scope.active = true;
   $scope.title = '';
 
@@ -18,8 +22,14 @@ angular.module('app').controller("TargetsController", ["$scope", "Kong", "$route
 
   $scope.loadMore = function() {
     var page = '/upstreams/' + upstream.id + '/targets';
-    if ($scope.active) {
-      page += "/active";
+    if (env.kong_version.indexOf("0.12.")==-1) {//<0.12
+      if ($scope.active){
+        page += "/active";
+      }
+    }else{//>=0.12
+      if (!$scope.active){
+        page += "/all";
+      }
     }
     if ($scope.offset) {
       page += '?offset=' + $scope.offset + '&';