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-rw-r--r--synapse/util/caches/lrucache.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/synapse/util/caches/lrucache.py b/synapse/util/caches/lrucache.py
index 7548b38548..45ff0de638 100644
--- a/synapse/util/caches/lrucache.py
+++ b/synapse/util/caches/lrucache.py
@@ -560,8 +560,10 @@ class LruCache(Generic[KT, VT]):
         def cache_pop(key: KT, default: Optional[T] = None) -> Union[None, T, VT]:
             node = cache.get(key, None)
             if node:
-                delete_node(node)
+                evicted_len = delete_node(node)
                 cache.pop(node.key, None)
+                if metrics:
+                    metrics.inc_evictions(EvictionReason.invalidation, evicted_len)
                 return node.value
             else:
                 return default