Full metric description (#7493)

graph: add full metric description for graph-legend-alias title

public/app/plugins/panel/graph/legend.js

@@ -167,7 +167,7 @@ function (angular, _, $) {
             html += '<i class="fa fa-minus pointer" style="color:' + series.color + '"></i>';
             html += '</div>';
 
-            html += '<a class="graph-legend-alias pointer">' + _.escape(series.label) + '</a>';
+            html += '<a class="graph-legend-alias pointer" title="' + _.escape(series.label) + '">' + _.escape(series.label) + '</a>';
 
             if (panel.legend.values) {
               var avg = series.formatValue(series.stats.avg);