diff --git a/inventory/groups.yaml b/inventory/groups.yaml
index 2dc3a55060..4ff6602219 100644
--- a/inventory/groups.yaml
+++ b/inventory/groups.yaml
@@ -73,7 +73,8 @@ groups:
     - kdc[0-9]*.open*.org
   kubernetes:
     - opendev-k8s*.opendev.org
-  letsencrypt: []
+  letsencrypt:
+    - graphite01.opendev.org
   logstash:
     - logstash[0-9]*.open*.org
   logstash-worker: