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-rw-r--r--synapse/storage/databases/main/deviceinbox.py18
1 files changed, 18 insertions, 0 deletions
diff --git a/synapse/storage/databases/main/deviceinbox.py b/synapse/storage/databases/main/deviceinbox.py
index 7c9d1f744e..50e7ddd735 100644
--- a/synapse/storage/databases/main/deviceinbox.py
+++ b/synapse/storage/databases/main/deviceinbox.py
@@ -15,6 +15,7 @@
 import logging
 from typing import List, Optional, Tuple
 
+from synapse.logging import issue9533_logger
 from synapse.logging.opentracing import log_kv, set_tag, trace
 from synapse.replication.tcp.streams import ToDeviceStream
 from synapse.storage._base import SQLBaseStore, db_to_json
@@ -404,6 +405,13 @@ class DeviceInboxWorkerStore(SQLBaseStore):
                 ],
             )
 
+            if remote_messages_by_destination:
+                issue9533_logger.debug(
+                    "Queued outgoing to-device messages with stream_id %i for %s",
+                    stream_id,
+                    list(remote_messages_by_destination.keys()),
+                )
+
         async with self._device_inbox_id_gen.get_next() as stream_id:
             now_ms = self.clock.time_msec()
             await self.db_pool.runInteraction(
@@ -533,6 +541,16 @@ class DeviceInboxWorkerStore(SQLBaseStore):
             ],
         )
 
+        issue9533_logger.debug(
+            "Stored to-device messages with stream_id %i for %s",
+            stream_id,
+            [
+                (user_id, device_id)
+                for (user_id, messages_by_device) in local_by_user_then_device.items()
+                for device_id in messages_by_device.keys()
+            ],
+        )
+
 
 class DeviceInboxBackgroundUpdateStore(SQLBaseStore):
     DEVICE_INBOX_STREAM_ID = "device_inbox_stream_drop"