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add comment about why unreg

This commit is contained in:
Amber Brown 2018-05-28 19:14:41 +10:00
parent a2eb5db4a0
commit 357c74a50f
1 changed files with 2 additions and 0 deletions
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2
synapse/util/caches/__init__.py
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@ -41,6 +41,8 @@ response_cache_total = Gauge("synapse_util_caches_response_cache:total", "", ["n
def register_cache(cache_type, cache_name, cache): def register_cache(cache_type, cache_name, cache):
# Check if the metric is already registered. Unregister it, if so. # 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) metric_name = "cache_%s_%s" % (cache_type, cache_name)
if metric_name in collectors_by_name.keys(): if metric_name in collectors_by_name.keys():
REGISTRY.unregister(collectors_by_name[metric_name]) REGISTRY.unregister(collectors_by_name[metric_name])