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-rw-r--r--synapse/handlers/federation_event.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/synapse/handlers/federation_event.py b/synapse/handlers/federation_event.py
index 06343d40e4..9a08618da5 100644
--- a/synapse/handlers/federation_event.py
+++ b/synapse/handlers/federation_event.py
@@ -890,6 +890,11 @@ class FederationEventHandler:
             # Continue on with the events that are new to us.
             new_events.append(event)
 
+        set_tag(
+            SynapseTags.RESULT_PREFIX + "new_events.length",
+            str(len(new_events)),
+        )
+
         # We want to sort these by depth so we process them and
         # tell clients about them in order.
         sorted_events = sorted(new_events, key=lambda x: x.depth)