JmPotato comments

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                                            JmPotato

Cargo.toml, src: fix the building feature of the rand crate

Maybe a new version v0.8.1 is needed after merging this PR? cc @kennytm

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建议：热点调度

@longlongago7777 热点调度是会考虑 Follower 的流量的，您说的“提示说明”具体一点是指什么呀？

建议：热点调度

@longlongago7777 了解，我们尽快完善一下，感谢反馈！

Collect the gRPC Poll CPU utilization

> Interesting idea! How to map the usage to requests? And what's the performance impact? We can start an independent thread in the background to sample at a fixed frequency...

`safeTSUpdater` increases tikv load

Could we make it only start to update when the user uses the Stale Read for the first time? @Yisaer

Tracking Issue for Flashback

/cc @husharp @Connor1996

Rollback all locks to prevent from losing the pessimistic lock in flashback

/cc @HuSharp @Defined2014

Rollback all locks to prevent from losing the pessimistic lock in flashback

> Can you elaborate on why the transaction can commit successfully with the lock deleted Since TiKV may fail to write pessimistic locks due to pipelined process. If the data...

Rollback all locks to prevent from losing the pessimistic lock in flashback

Hi, @sticnarf could you please help add a type label to this issue and merge #13521? I don't have permission, thx a lot!