Fix new metric where we used ms instead of seconds (#7771)

Introduced in #7755, not yet released.

1 files changed, 1 insertions, 1 deletions

diff --git a/synapse/federation/sender/__init__.py b/synapse/federation/sender/__init__.py

index 23fb515683..464d7a41de 100644
--- a/synapse/federation/sender/__init__.py
+++ b/synapse/federation/sender/__init__.py
@@ -209,7 +209,7 @@ class FederationSender(object):
 
                         synapse.metrics.event_processing_lag_by_event.labels(
                             "federation_sender"
-                        ).observe(now - ts)
+                        ).observe((now - ts) / 1000)
 
                 async def handle_room_events(events: Iterable[EventBase]) -> None:
                     with Measure(self.clock, "handle_room_events"):