code: function() {
        var t = this,
            map = {},
            router = Monitor.getRouter(),
            hostName = Monitor.getRouter().getHostName(),
            appName = Monitor.Config.Monitor.appName,
            appInstance = process.env.NODE_APP_INSTANCE;
  
        // Add this process to the map
        map[hostName] = {};
        map[hostName][appName] = {
          instances: [appInstance],
          probeClasses: _.keys(Probe.classes)
        };
  
        // Process all known connections
        var connections = router.findConnections();
        connections.forEach(function(connection) {
          hostName = connection.get('hostName') || connection.get('remoteHostName');
          appName = connection.get('remoteAppName') || '';
          appInstance = connection.get('remoteAppInstance') || '';
  
          // Don't add to the map not yet connected
          if (connection.connecting || !connection.connected) {
            return;
          }
  
          // Add the hostname to the map
          var host = map[hostName];
          if (!host) {
            host = map[hostName] = {};
          }
  
          // Add the app to the map
          var app = host[appName];
          if (!app) {
            app = host[appName] = {
              instances: [appInstance],
              probeClasses: connection.get('remoteProbeClasses')
            };
          } else {
            app.instances.push(appInstance);
          }
        });
        log.info('buildMap', map);
  
        // Set the map if it's changed.  This method is called whenever
        // connections come and go - including firewalled connections which
        // aren't visible in the map.  Only update if the map has changed.
        if (!_.isEqual(map, t.get('map'))) {
          log.info('mapChanged');
          t.set({
            map: map,
            updateSequence: t.updateSequence++
          });
        } else {
          log.info('mapNotChanged');
        }
      }
docs: This builds a new site map, and sets it into the map property if it is different from the current map.