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add comment about why unreg
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@ -41,6 +41,8 @@ response_cache_total = Gauge("synapse_util_caches_response_cache:total", "", ["n
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def register_cache(cache_type, cache_name, cache):
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# Check if the metric is already registered. Unregister it, if so.
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# This usually happens during tests, as at runtime these caches are
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# effectively singletons.
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metric_name = "cache_%s_%s" % (cache_type, cache_name)
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if metric_name in collectors_by_name.keys():
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REGISTRY.unregister(collectors_by_name[metric_name])
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