track response codes with statsd

apps/amo/middleware.py

@@ -18,6 +18,7 @@ import commonware.log
 import MySQLdb as mysql
 import tower
 import jingo
+from statsd import statsd
 
 import amo
 from . import urlresolvers
@@ -174,3 +175,13 @@ 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

@@ -243,6 +243,7 @@ def JINJA_CONFIG():
 MIDDLEWARE_CLASSES = (
     # AMO URL middleware comes first so everyone else sees nice URLs.
     'amo.middleware.TimingMiddleware',
+    'amo.middleware.GraphiteMiddleware',
     'amo.middleware.LocaleAndAppURLMiddleware',
     # Mobile detection should happen in Zeus.
     'mobility.middleware.DetectMobileMiddleware',
@@ -986,3 +987,7 @@ TASK_USER_ID = 4757633
 # If this is False, tasks and other jobs that send non-critical emails should
 # use a fake email backend.
 SEND_REAL_EMAIL = False
+
+STATSD_HOST = 'localhost'
+STATSD_PORT = 8125
+STATSD_PREFIX = 'amo'