fix: usage stats missing cluster id (#913)

Author: knudtty

.changeset/violet-impalas-bathe.md

@@ -0,0 +1,5 @@
+---
+"@hyperdx/api": patch
+---
+
+fix: usage stats missing cluster id

packages/api/src/tasks/usageStats.ts

@@ -127,7 +127,7 @@ async function getUsageStats() {
       ).limit(1),
       getClickhouseTableSize(),
     ]);
-    const clusterId = team[0]?._id;
+    const clusterId = team[0]?._id.toString();
     logger.info({
       message: 'track-hyperdx-oss-usage-stats',
       clusterId,