use the GraphiteMiddleware from commonware

apps/amo/middleware.py

@@ -18,7 +18,6 @@ import commonware.log
 import MySQLdb as mysql
 import tower
 import jingo
-from statsd import statsd
 
 import amo
 from . import urlresolvers
@@ -177,13 +176,3 @@ class TimingMiddleware(object):
         msg = '{method} "{url}" ({code}) {time:.2f} [{auth}]'.format(**d)
         timing_log.info(msg)
         return response
-
-
-class GraphiteMiddleware(object):
-
-    def process_response(self, request, response):
-        statsd.incr('response.%s' % response.status_code)
-        return response
-
-    def process_exception(self, request, exception):
-        statsd.incr('response.500')

settings.py

@@ -247,7 +247,7 @@ MIDDLEWARE_CLASSES = (
     # AMO URL middleware comes first so everyone else sees nice URLs.
     'amo.middleware.TimingMiddleware',
     'commonware.response.middleware.GraphiteRequestTimingMiddleware',
-    'amo.middleware.GraphiteMiddleware',
+    'commonware.response.middleware.GraphiteMiddleware',
     'amo.middleware.LocaleAndAppURLMiddleware',
     # Mobile detection should happen in Zeus.
     'mobility.middleware.DetectMobileMiddleware',