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-rw-r--r--synapse/storage/devices.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/synapse/storage/devices.py b/synapse/storage/devices.py
index 76542c512d..41f62828bd 100644
--- a/synapse/storage/devices.py
+++ b/synapse/storage/devices.py
@@ -23,6 +23,7 @@ from twisted.internet import defer
 from synapse.api.errors import StoreError
 from synapse.logging.opentracing import (
     get_active_span_text_map,
+    set_tag,
     trace,
     whitelisted_homeserver,
 )
@@ -321,6 +322,7 @@ class DeviceWorkerStore(SQLBaseStore):
     def get_device_stream_token(self):
         return self._device_list_id_gen.get_current_token()
 
+    @trace
     @defer.inlineCallbacks
     def get_user_devices_from_cache(self, query_list):
         """Get the devices (and keys if any) for remote users from the cache.
@@ -352,6 +354,9 @@ class DeviceWorkerStore(SQLBaseStore):
             else:
                 results[user_id] = yield self._get_cached_devices_for_user(user_id)
 
+        set_tag("in_cache", results)
+        set_tag("not_in_cache", user_ids_not_in_cache)
+
         return user_ids_not_in_cache, results
 
     @cachedInlineCallbacks(num_args=2, tree=True)