Don't measure across event stream call, as it lasts for a long time.

synapse/push/__init__.py

@@ -128,7 +128,6 @@ class Pusher(object):
                 try:
                     if wait > 0:
                         yield synapse.util.async.sleep(wait)
-                    with Measure(self.clock, "push"):
                     yield self.get_and_dispatch()
                     wait = 0
                 except:
@@ -151,6 +150,7 @@ class Pusher(object):
             only_keys=("room", "receipt",),
         )
 
+        with Measure(self.clock, "push"):
             # limiting to 1 may get 1 event plus 1 presence event, so
             # pick out the actual event
             single_event = None