The instance.tidb_slow_log_threshold parameter is invalid

This topic has been translated from a Chinese forum by GPT and might contain errors.

Original topic: instance.tidb_slow_log_threshold 参数无效

| username: TiDBer_oTsnOsUb

[TiDB Usage Environment] Production Environment
[TiDB Version] 8.1

[Encountered Problem: Phenomenon and Impact]
Modifying the TiDB node parameter instance.tidb_slow_log_threshold and the global variable is ineffective. In the slow log records, SQL queries below the threshold can still be found.