JmPotato comments

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                                            JmPotato

fix(runaway): resolve the dead chanel in UpdateNewAndDoneWatch

/test unit-test

fix(runaway): resolve the dead chanel in UpdateNewAndDoneWatch

/retest

fix(runaway): resolve the dead chanel in UpdateNewAndDoneWatch

/test pull-lightning-integration-test

fix(runaway): resolve the dead chanel in UpdateNewAndDoneWatch

/cherry-pick release-8.5

fix(runaway): resolve the dead chanel in UpdateNewAndDoneWatch

/cherry-pick release-8.1

Add an explanation about the variable @@tidb_enable_batch_query_region

/hold

workload always report Error 9001 (HY000): PD server timeout

It's introduced in https://github.com/tikv/pd/commit/6eac733cee4a8997f01fd080a4e9da406a02784b#diff-052e4d1530c8218aa0d42e835ab3c1a9bb5f6dab6fe066b3987a68d69279ada9R177. We should not exit the allocator updater even if the update fails; otherwise, the TSO will stop advancing, eventually causing all TSO requests to time out.

qps drop more than 2 mins and also affect pitr and cdc lag when injection pd leader io delay 500ms or 1s or io hang due to a circuit breaker mechanism which is by design

According to the log, the original leader pd-1 stepped down from leadership at 12:12:19 due to a failure in lease renewal. ```log {"container":"pd","namespace":"uds-cdc-br-scenario-tps-7624385-1-510","log":"[server.go:1813] [\"no longer a leader because lease has...

tso: fix tso client fallback group

/ok-to-test

`clock offset` is not clear enough

> > clock offset could be one of the reasons > > What other reasons need to be explained? PD restart? Leader transfer? > > Or is it sufficient to...