From 357c74a50f1e1588a6a3d626bddb3555452c6f56 Mon Sep 17 00:00:00 2001 From: Amber Brown Date: Mon, 28 May 2018 19:14:41 +1000 Subject: [PATCH] add comment about why unreg --- synapse/util/caches/__init__.py | 2 ++ 1 file changed, 2 insertions(+) diff --git a/synapse/util/caches/__init__.py b/synapse/util/caches/__init__.py index d968b71e7..183faf75a 100644 --- a/synapse/util/caches/__init__.py +++ b/synapse/util/caches/__init__.py @@ -41,6 +41,8 @@ response_cache_total = Gauge("synapse_util_caches_response_cache:total", "", ["n def register_cache(cache_type, cache_name, cache): # Check if the metric is already registered. Unregister it, if so. + # This usually happens during tests, as at runtime these caches are + # effectively singletons. metric_name = "cache_%s_%s" % (cache_type, cache_name) if metric_name in collectors_by_name.keys(): REGISTRY.unregister(collectors_by_name[metric_name])