From ca3c07e833816e69bbaf0372e6cc79f52e6db88e Mon Sep 17 00:00:00 2001
From: Eric Eastwood <erice@element.io>
Date: Fri, 19 May 2023 11:18:45 -0500
Subject: [PATCH] Trace how many new events from the backfill response we need
to process (#15633)
You can kinda derive this information from how many `_process_pulled_event` spans there are but it would be nice to quickly glance.
---
changelog.d/15633.misc | 1 +
synapse/handlers/federation_event.py | 5 +++++
2 files changed, 6 insertions(+)
create mode 100644 changelog.d/15633.misc
diff --git a/changelog.d/15633.misc b/changelog.d/15633.misc
new file mode 100644
index 0000000000..4126a20602
--- /dev/null
+++ b/changelog.d/15633.misc
@@ -0,0 +1 @@
+Trace how many new events from the backfill response we need to process.
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)