## Bug Report <!-- Please answer these questions before submitting your issue. Thanks! --> ### What did you do? 1. call `WithInitMetrics(false)` when creating pd client in tidb 2. start tidb <!-- If possible, provide a recipe for reproducing the error. --> ### What did you expect to see? 1. no panic ### What did you see instead? 1. panic ### What version of PD are you using (`pd-server -V`)?