Jinhao Hu comments

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                                            Jinhao Hu

primary changed twice when pdms rolling update

### For tiup 1. When we have 3 pdms, pdms-0/pdms-1/pdms-2, and pdms-2 is primary 2. upgrade pdms-2 firstly maybe transfer primary to pdms-0 3. uprade pdms-0 will transfer primary again...

*: upgrade etcd to v3.4.31 (#8017)

@asddongmen PTAL, thx!

*: upgrade etcd to v3.4.31 (#8017)

/merge

lease: keep alive Leadership immediately after finish the election of leader

> Do we still need this pr? Will it need to be picked to 7.5? I don't think this pr is needed for now, Let's close it for now.

pd-ctl: show `approximate_kv_size` in region info

@zeminzhou pls link a issue

*: check raftcluster nil (#7054)

/test

*: check raftcluster nil (#7054)

/merge

pd-server deploy failed when change source code

Did you check your `git tag`?

pd-server deploy failed when change source code

Is it convenient to run `git tag` under your pd repository? The purpose is to check if a tag is related to `fd2094e`.

pd: support schema change by tls

/test all