diff --git a/src/data/relay_metrics.json b/src/data/relay_metrics.json
index 59398b5af44e0..192405cb05a0b 100644
--- a/src/data/relay_metrics.json
+++ b/src/data/relay_metrics.json
@@ -723,6 +723,12 @@
     "description": "A number of messages queued in a services inbound message channel.\n\nThis metric is emitted once per second for every running service. Without backlogs, this\nnumber should be close to `0`. If this number is monotonically increasing, the service is\nnot able to process the inbound message volume.\n\nThis metric is tagged with:\n- `service`: The fully qualified type name of the service implementation.",
     "features": []
   },
+  {
+    "type": "Timer",
+    "name": "spool.initialization",
+    "description": "Timing in milliseconds for the time it takes for initialize the spooler.",
+    "features": []
+  },
   {
     "type": "Timer",
     "name": "store.message.duration",