def aggregate(request)
      @trackers.each do |tracker|
        tracker.update(request) if tracker.should_update?(request)
      end
    end
def aggregate(request)
      @trackers.each do |tracker|
        tracker.update(request) if tracker.should_update?(request)
      end
    end
Pass all requests to trackers and let them update if necessary.
 <tt>request</tt> The request to pass.