add link to api browser and link to knowledgebase for alert polling

issue #633

Author: kroepke

app/controllers/AlertsController.java

@@ -22,15 +22,11 @@
 import com.google.inject.Inject;
 import lib.APIException;
 import lib.ApiClient;
-import models.User;
-import models.UserService;
+import models.*;
 import models.alerts.Alert;
 import models.alerts.AlertCondition;
 import models.alerts.AlertConditionService;
-import models.Stream;
-import models.StreamService;
 import models.api.requests.alerts.CreateAlertConditionRequest;
-import play.Logger;
 import play.mvc.Result;
 
 import java.io.IOException;
@@ -51,6 +47,9 @@ public class AlertsController extends AuthenticatedController {
     @Inject
     private AlertConditionService alertConditionService;
 
+    @Inject
+    private NodeService nodeService;
+
     public Result index(String streamId) {
         try {
             Stream stream = streamService.get(streamId);
@@ -78,7 +77,8 @@ public Result index(String streamId) {
                     alertConditions,
                     totalAlerts,
                     alerts,
-                    users.toString()
+                    users.toString(),
+                    nodeService.loadMasterNode()
             ));
         } catch (IOException e) {
             return status(504, views.html.errors.error.render(ApiClient.ERROR_MSG_IO, e, request()));

app/views/alerts/manage.scala.html

@@ -2,7 +2,8 @@
         alertConditions: List[models.alerts.AlertCondition],
         totalAlerts: Long,
         alerts: List[models.alerts.Alert],
-        users: String)
+        users: String,
+        node: Node)
 
 @import lib.security.RestPermissions._
 @import views.helpers.Permissions._
@@ -228,8 +229,9 @@ <h2><i class="icon icon-group"></i> Alert receivers</h2>
     <hr />
 
     <h2><i class="icon icon-bell"></i> Triggered alerts</h2>
-    Showing the most recent alerts. This stream triggered a total of @totalAlerts alerts.
-
+    Showing the most recent alerts. This stream triggered a total of <b>@totalAlerts alerts</b>.<br>
+    Alerts can be retrieved from the server's <a href="@node.getTransportAddress/api-browser#!/Alerts/checkConditions_get_1" target="_blank">API Browser <i class="icon icon-external-link" style="font-size: 11px;"></i></a>,
+        for example to hook them into an existing monitoring system. Learn more in the knowledgebase. @views.html.partials.support.bubble("graylog2-server/polling-for-stream-alerts")
     @if(stream.getAlerts.isEmpty) {
         <div style="margin-top: 10px;" class="alert alert-info">
             This stream has never triggered an alert.