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-rw-r--r--synapse/util/caches/__init__.py7
1 files changed, 5 insertions, 2 deletions
diff --git a/synapse/util/caches/__init__.py b/synapse/util/caches/__init__.py
index 1c511a7072..e0c22df249 100644
--- a/synapse/util/caches/__init__.py
+++ b/synapse/util/caches/__init__.py
@@ -29,13 +29,16 @@ cache_total = Gauge("synapse_util_caches_cache:total", "", ["name"])
 
 response_cache_size = Gauge("synapse_util_caches_response_cache:size", "", ["name"])
 response_cache_hits = Gauge("synapse_util_caches_response_cache:hits", "", ["name"])
-response_cache_evicted = Gauge("synapse_util_caches_response_cache:evicted_size", "", ["name"])
+response_cache_evicted = Gauge(
+    "synapse_util_caches_response_cache:evicted_size", "", ["name"]
+)
 response_cache_total = Gauge("synapse_util_caches_response_cache:total", "", ["name"])
 
+
 def register_cache(cache_type, cache_name, cache):
 
     # Check if the metric is already registered. Unregister it, if so.
-    metric_name = "cache_%s_%s" % (cache_type, cache_name,)
+    metric_name = "cache_%s_%s" % (cache_type, cache_name)
     if metric_name in collectors_by_name.keys():
         REGISTRY.unregister(collectors_by_name[metric_name])