无法修改慢日志文件路径

[ShiQiFangxiao]

Bug Report

Please answer these questions before submitting your issue. Thanks!
一、问题描述：

1. Minimal reproduce step (Required)

二、问题复现：
1、通过tiup cluster edit-config xxx修改慢日志文件名
server_configs:
tidb:
log.slow-query-file: /tidb-deploy/tidb-4000/log/testslow.log

2、reload集群：tiup cluster reload xxx

3、查看慢日志路径，对应的值是/tidb-deploy/tidb-4000/log/tidb_slow_query.log，并没有被改成testslow.log
show config where name like '%slow%';

4、如果将/tidb-deploy/deploy/tidb-4000/scripts/run_tidb.sh中slow-log的配置删除掉，然后重启restart集群，可以生成新路径的slowlog；但如果执行reload操作，又会被还原成/tidb-deploy/tidb-4000/log/testslow.log路径

2. What did you expect to see? (Required)

期望结果：
希望能正常修改慢日志路径。

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

tidb v8.1.0

[tiancaiamao]

This is not a TiDB bug, we should report a bug to tiup https://github.com/pingcap/tiup/issues/new?assignees=&labels=type%2Fbug&projects=&template=bug-report.md

[tiancaiamao]

I create a new one and close this one pingcap/tiup#2428