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-rw-r--r--synapse/metrics/_reactor_metrics.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/synapse/metrics/_reactor_metrics.py b/synapse/metrics/_reactor_metrics.py
index f38f798313..a2c6e6842d 100644
--- a/synapse/metrics/_reactor_metrics.py
+++ b/synapse/metrics/_reactor_metrics.py
@@ -21,6 +21,8 @@ from prometheus_client.core import REGISTRY, GaugeMetricFamily
 
 from twisted.internet import reactor
 
+from synapse.metrics._types import Collector
+
 #
 # Twisted reactor metrics
 #
@@ -54,7 +56,7 @@ class EpollWrapper:
         return getattr(self._poller, item)
 
 
-class ReactorLastSeenMetric:
+class ReactorLastSeenMetric(Collector):
     def __init__(self, epoll_wrapper: EpollWrapper):
         self._epoll_wrapper = epoll_wrapper