From 4642fd66df510d6639ba66891ad2ae22564b3591 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Fri, 17 Jul 2020 12:10:43 +0100
Subject: [PATCH] Change "unknown room ver" logging to warning. (#7881)

It's somewhat expected for us to have unknown room versions in the
database due to room version experiments.
---
 changelog.d/7881.misc                             | 1 +
 synapse/storage/data_stores/main/events_worker.py | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)
 create mode 100644 changelog.d/7881.misc

diff --git a/changelog.d/7881.misc b/changelog.d/7881.misc
new file mode 100644
index 000000000..679911709
--- /dev/null
+++ b/changelog.d/7881.misc
@@ -0,0 +1 @@
+Change "unknown room version" logging from 'error' to 'warning'.
diff --git a/synapse/storage/data_stores/main/events_worker.py b/synapse/storage/data_stores/main/events_worker.py
index a7d685f63..e812c6707 100644
--- a/synapse/storage/data_stores/main/events_worker.py
+++ b/synapse/storage/data_stores/main/events_worker.py
@@ -639,7 +639,7 @@ class EventsWorkerStore(SQLBaseStore):
             else:
                 room_version = KNOWN_ROOM_VERSIONS.get(room_version_id)
                 if not room_version:
-                    logger.error(
+                    logger.warning(
                         "Event %s in room %s has unknown room version %s",
                         event_id,
                         d["room_id"],