Option to show hostname in annotation

A new checkbox in the annotation configuration form allows
to prefix the hostname to the title used in the annotation.

This option is relevant for people not stating the hostname
in their triggers. Within Zabbix, the hostname would be shown
redundantly everywhere, except in notifications.

zabbix/datasource.js

@@ -365,7 +365,8 @@ function (angular, _, dateMath) {
               time_from: from,
               time_till: to,
               objectids: _.keys(objects),
-              select_acknowledges: 'extend'
+              select_acknowledges: 'extend',
+              selectHosts: 'extend'
             };
 
             // Show problem events only
@@ -376,12 +377,19 @@ function (angular, _, dateMath) {
             return self.zabbixAPI.performZabbixAPIRequest('event.get', params)
               .then(function (result) {
                 var events = [];
+
+                var title ='';
+                if (options.annotation.showHostname) {
+                  title += e.hosts[0]['name'] + ': ';
+                }
+                title += Number(e.value) ? 'Problem' : 'OK';
+
                 _.each(result, function(e) {
                   var formatted_acknowledges = zabbixHelperSrv.formatAcknowledges(e.acknowledges);
                   events.push({
                     annotation: options.annotation,
                     time: e.clock * 1000,
-                    title: Number(e.value) ? 'Problem' : 'OK',
+                    title: title,
                     text: objects[e.objectid].description + formatted_acknowledges
                   });
                 });