branch-2.1: [fix](bug) Fix dead lock in Tablet Stat Mgr (#47242)

fe/fe-common/src/main/java/org/apache/doris/common/Config.java

@@ -283,6 +283,10 @@ public class Config extends ConfigBase {
             "Queue size to store heartbeat task in heartbeat_mgr"})
     public static int heartbeat_mgr_blocking_queue_size = 1024;
 
+    @ConfField(masterOnly = true, description = {"TabletStatMgr线程数",
+            "Num of thread to update tablet stat"})
+    public static int tablet_stat_mgr_threads_num = -1;
+
     @ConfField(masterOnly = true, description = {"Agent任务线程池的线程数",
             "Num of thread to handle agent task in agent task thread-pool"})
     public static int max_agent_task_threads_num = 4096;