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:

• disksing
• nolouch

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[codecov]

Codecov Report

Merging #4083 (8372f9d) into release-5.1 (14c12cd) will increase coverage by 0.01%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           release-5.1    #4083      +/-   ##
===============================================
+ Coverage        75.03%   75.04%   +0.01%     
===============================================
  Files              245      245              
  Lines            24558    24554       -4     
===============================================
  Hits             18426    18426              
+ Misses            4513     4508       -5     
- Partials          1619     1620       +1     

Flag	Coverage Δ
unittests	75.04% <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	81.00% <ø> (+0.89%)	⬆️
pkg/tempurl/tempurl.go	45.00% <0.00%> (-25.00%)	⬇️
server/tso/local_allocator.go	80.55% <0.00%> (-9.73%)	⬇️
pkg/dashboard/adapter/manager.go	78.72% <0.00%> (-4.26%)	⬇️
server/tso/tso.go	70.78% <0.00%> (-2.25%)	⬇️
server/tso/allocator_manager.go	76.96% <0.00%> (-1.51%)	⬇️
server/server.go	71.62% <0.00%> (-0.61%)	⬇️
server/cluster/cluster.go	82.88% <0.00%> (-0.36%)	⬇️
server/id/id.go	80.95% <0.00%> (ø)
... and 8 more

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[HunDunDM]

/merge

[ti-chi-bot]

@HunDunDM: 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: 8372f9d