checker: judging that the peer is down is no longer based on DownSeconds (#4078)

[ti-chi-bot]

This is an automated cherry-pick of #4078

Signed-off-by: HunDunDM hundundm@gmail.com

What problem does this PR solve?

Fix #4077

After #3462, DownSeconds no longer update with the heartbeat. It will cause the down-peer to not be repaired in time.

What is changed and how it works?

Judging that the peer is down is no longer based on DownSeconds.

Check List

Tests

• Unit test

Code changes

Side effects

• Breaking backward compatibility
  • PD judge that the peer is down is no longer based on DownSeconds. In extreme cases, down-peers that would not have been processed will be fixed.

Related changes

• Need to cherry-pick to the release branch

Release note

Fix the bug that PD would not fix down-peer in time.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HunDunDM
• nolouch

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[HunDunDM]

/rebuild

[nolouch]

/merge

[ti-chi-bot]

@nolouch: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 5bc1a82

[codecov]

Codecov Report

Merging #4082 (5bc1a82) into release-5.0 (1542092) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           release-5.0    #4082      +/-   ##
===============================================
- Coverage        74.96%   74.95%   -0.01%     
===============================================
  Files              245      245              
  Lines            24327    24323       -4     
===============================================
- Hits             18237    18232       -5     
+ Misses            4489     4486       -3     
- Partials          1601     1605       +4     

Flag	Coverage Δ
unittests	74.95% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/schedule/checker/replica_checker.go	71.11% <ø> (+1.03%)	⬆️
server/schedule/checker/rule_checker.go	84.21% <ø> (+1.09%)	⬆️
pkg/tempurl/tempurl.go	45.00% <0.00%> (-25.00%)	⬇️
server/tso/global_allocator.go	71.01% <0.00%> (-6.53%)	⬇️
server/region_syncer/server.go	83.08% <0.00%> (-5.89%)	⬇️
server/id/id.go	76.19% <0.00%> (-4.77%)	⬇️
server/tso/local_allocator.go	80.55% <0.00%> (-2.78%)	⬇️
server/election/leadership.go	83.52% <0.00%> (-2.36%)	⬇️
server/schedule/operator/step.go	66.77% <0.00%> (-2.33%)	⬇️
server/server.go	72.89% <0.00%> (-0.76%)	⬇️
... and 10 more

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