mds: do not infinitely recursively print a metric

Fixes: b1b44d775df3160d937c068d5e1079e24199ed6b
Fixes: https://tracker.ceph.com/issues/51067
Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>

diff --git a/src/include/cephfs/metrics/Types.h b/src/include/cephfs/metrics/Types.h
index d5589136de29e69c52078f105acb0272692eacc1..16c87712084bb50076603f6994411bcf4e2b0f14 100644 (file)
--- a/src/include/cephfs/metrics/Types.h
+++ b/src/include/cephfs/metrics/Types.h
@@ -53,7 +53,8 @@ inline std::ostream &operator<<(std::ostream &os, const ClientMetricType &type)
     os << "OPENED_INODES";
     break;
   default:
-    os << "Unknown metric type: " << type;
+    os << "(UNKNOWN:" << static_cast<std::underlying_type<ClientMetricType>::type>(type) << ")";
+    break;
   }
 
   return os;