diff --git a/control/prometheus.py b/control/prometheus.py
index 106ead59..ec2fa115 100644
--- a/control/prometheus.py
+++ b/control/prometheus.py
@@ -421,6 +421,7 @@ def collect(self):
         yield subsystem_metadata
         yield subsystem_listeners
         yield subsystem_host_count
+        yield subsystem_namespace_count 
         yield subsystem_namespace_limit
         yield subsystem_namespace_metadata
         yield host_connection_state