Attempt to include db threads in cpu usage stats (#3496)

Let's try to include time spent in the DB threads in the per-request/block cpu
usage metrics.

1 files changed, 2 insertions, 1 deletions

diff --git a/synapse/storage/events_worker.py b/synapse/storage/events_worker.py

index fa2659403d..67433606c6 100644
--- a/synapse/storage/events_worker.py
+++ b/synapse/storage/events_worker.py
@@ -261,7 +261,8 @@ class EventsWorkerStore(SQLBaseStore):
                 ]
 
                 rows = self._new_transaction(
-                    conn, "do_fetch", [], [], None, self._fetch_event_rows, event_ids
+                    conn, "do_fetch", [], [],
+                    self._fetch_event_rows, event_ids,
                 )
 
                 row_dict = {