add RackTimer

config.ru

@@ -15,4 +15,20 @@ skip   = ['Travis::Memory', 'GH::ResponseWrapper', 'Travis::NewRelic']
   target.load_constants! :only => only, :skip => skip, :debug => false
 end
 
+# https://help.heroku.com/tickets/92756
+class RackTimer
+  def initialize(app)
+    @app = app
+  end
+
+  def call(env)
+    start_request = Time.now
+    status, headers, body = @app.call(env)
+    elapsed = (Time.now - start_request) * 1000
+    $stdout.puts("request-id=#{env['HTTP_HEROKU_REQUEST_ID']} measure.rack-request=#{elapsed.round}ms")
+    [status, headers, body]
+  end
+end
+
+use RackTimer
 run Travis::Api::App.new