diff --git a/changelog.d/7878.removal b/changelog.d/7878.removal
new file mode 100644
index 000000000..d5a406662
--- /dev/null
+++ b/changelog.d/7878.removal
@@ -0,0 +1 @@
+Remove unused `synapse_replication_tcp_resource_invalidate_cache` prometheus metric.
diff --git a/synapse/replication/tcp/handler.py b/synapse/replication/tcp/handler.py
index f88e0a2e4..1de590bba 100644
--- a/synapse/replication/tcp/handler.py
+++ b/synapse/replication/tcp/handler.py
@@ -67,9 +67,7 @@ inbound_rdata_count = Counter(
 user_sync_counter = Counter("synapse_replication_tcp_resource_user_sync", "")
 federation_ack_counter = Counter("synapse_replication_tcp_resource_federation_ack", "")
 remove_pusher_counter = Counter("synapse_replication_tcp_resource_remove_pusher", "")
-invalidate_cache_counter = Counter(
-    "synapse_replication_tcp_resource_invalidate_cache", ""
-)
+
 user_ip_cache_counter = Counter("synapse_replication_tcp_resource_user_ip_cache", "")