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-rw-r--r--synapse/logging/opentracing.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/logging/opentracing.py b/synapse/logging/opentracing.py
index 3ebed5c161..f86ee9aac7 100644
--- a/synapse/logging/opentracing.py
+++ b/synapse/logging/opentracing.py
@@ -289,6 +289,9 @@ class SynapseTags:
     # Uniqueish ID of a database transaction
     DB_TXN_ID = "db.txn_id"
 
+    # The name of the external cache
+    CACHE_NAME = "cache.name"
+
 
 class SynapseBaggage:
     FORCE_TRACING = "synapse-force-tracing"