Merge commit 'f43c66d23' into anoa/dinsic_release_1_21_x

* commit 'f43c66d23':
  Add support for running Complement against the local checkout (#8317)
  Filter out appservices from mau count (#8404)
  Only assert valid next_link params when provided (#8417)
  Add metrics to track success/otherwise of replication requests (#8406)
  Fix handling of connection timeouts in outgoing http requests (#8400)
  Changelog
  Don't check whether a 3pid is allowed to register during password reset
  Add checks for postgres sequence consistency (#8402)
  Create a mechanism for marking tests "logcontext clean" (#8399)
  Add `ui_auth_sessions_ips` table to `synapse_port_db` ignore list (#8410)
  A pair of tiny cleanups in the federation request code. (#8401)
  typo

1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py

index 81134fcdf6..33feb1b2ba 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -281,7 +281,7 @@ class FederationHandler(BaseHandler):
                             raise Exception(
                                 "Error fetching missing prev_events for %s: %s"
                                 % (event_id, e)
-                            )
+                            ) from e
 
                         # Update the set of things we've seen after trying to
                         # fetch the missing stuff