Add indication of instrumentation active/inactive to analysis server status.

pkg/analysis_server/lib/src/get_handler.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library get.handler;
 
 import 'dart:convert';
 import 'dart:io';
 import 'dart:math';
 
@@ skipping 378 matching lines @@
     response.write('<h1>Analysis Server</h1>');
     AnalysisServer analysisServer = _server.analysisServer;
     if (analysisServer == null) {
       response.write('<p>Not running</p>');
     } else {
       if (analysisServer.statusAnalyzing) {
         response.write('<p>Running (analyzing)</p>');
       } else {
         response.write('<p>Running (not analyzing)</p>');
       }
+      response.write('<p>Instrumentation status: ');
+      if (AnalysisEngine.instance.instrumentationService.isActive) {
+        response.write('<span style="color:red">active</span>');
+      } else {
+        response.write('inactive');
+      }
+      response.write('</p>');
       response.write('<h1>Analysis Contexts</h1>');
       response.write('<h2>Summary</h2>');
       response.write('<table>');
       List headerRowText = ['Context'];
       headerRowText.addAll(CacheState.values);
       _writeRow(response, headerRowText, header: true);
       Map<Folder, AnalysisContext> folderMap = analysisServer.folderMap;
       List<Folder> folders = folderMap.keys.toList();
       folders.sort(
           (Folder first, Folder second) => first.shortName.compareTo(second.shortName));
@@ skipping 174 matching lines @@
       if (header) {
         response.write('</th>');
       } else {
         response.write('</td>');
       }
     }
 
     response.write('</tr>');
   }
 }