Clean up logging on event persister endpoints (matrix-org#16488)

changelog.d/16488.misc

@@ -0,0 +1 @@
+Clean up logging on event persister endpoints.

synapse/replication/http/federation.py

@@ -138,7 +138,11 @@ async def _handle_request(self, request: Request, content: JsonDict) -> Tuple[in
 
                 event_and_contexts.append((event, context))
 
-        logger.info("Got %d events from federation", len(event_and_contexts))
+        logger.info(
+            "Got batch of %i events to persist to room %s",
+            len(event_and_contexts),
+            room_id,
+        )
 
         max_stream_id = await self.federation_event_handler.persist_events_and_notify(
             room_id, event_and_contexts, backfilled

synapse/replication/http/send_events.py

@@ -118,6 +118,7 @@ async def _handle_request(  # type: ignore[override]
         with Measure(self.clock, "repl_send_events_parse"):
             events_and_context = []
             events = payload["events"]
+            rooms = set()
 
             for event_payload in events:
                 event_dict = event_payload["event"]
@@ -144,11 +145,13 @@ async def _handle_request(  # type: ignore[override]
                     UserID.from_string(u) for u in event_payload["extra_users"]
                 ]
 
-                logger.info(
-                    "Got batch of events to send, last ID of batch is: %s, sending into room: %s",
-                    event.event_id,
-                    event.room_id,
-                )
+                # all the rooms *should* be the same, but we'll log separately to be
+                # sure.
+                rooms.add(event.room_id)
+
+            logger.info(
+                "Got batch of %i events to persist to rooms %s", len(events), rooms
+            )
 
             last_event = (
                 await self.event_creation_handler.persist_and_notify_client_events(