Clean up metrics section in Heron UI (#3153)

diff --git a/heron/tools/ui/resources/static/js/stat-trendlines.js b/heron/tools/ui/resources/static/js/stat-trendlines.js
index bba30f9..b9f59e8 100644
--- a/heron/tools/ui/resources/static/js/stat-trendlines.js
+++ b/heron/tools/ui/resources/static/js/stat-trendlines.js
@@ -207,10 +207,8 @@
     } else if (instance === '*') {
       d3.select('#trendline-title').text(name + ' Metrics');
     } else {
-      d3.select('#trendline-title').text('Instance Metrics');
-    }
+      d3.select('#trendline-title').text(instance + ' Metrics');
 
-    if (instance !== '*') {
       container = instance.split("_")[1];
       target
         .append('div')
@@ -220,7 +218,6 @@
           '<a class="btn btn-primary btn-xs" target="_blank" href="/topologies/filestats/' + cluster + '/' + environ + '/' + toponame + '/' + container + '">job</a>',
           '<a class="btn btn-primary btn-xs" target="_blank" href="/topologies/' + cluster + '/' + environ + '/' + toponame + '/' + name + '/' + instance + '/exceptions">exceptions</a>',
           '<br>',
-          instance
         ].join(' '));
     }
   };