cluster: filter region heartbeats that contain overflow flow (#3415)

[ti-srebot]

cherry-pick #3415 to release-4.0
You can switch your code base to this Pull Request by using git-extras:

# In pd repo:
git pr https://github.com/tikv/pd/pull/3472

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/pd.git pr/3472:release-4.0-2cf81617e755

---

Signed-off-by: Zheng Xiangsheng hundundm@gmail.com

What problem does this PR solve?

• Related to /region in the API may return a huge written_keys #3379

What is changed and how it works?

• Since the flow in the region heartbeat by TiKV may overflow, clean up this part of the stat.

Check List

Tests

• Unit test

Release note

• No release note

[ti-chi-bot]

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[ti-srebot]

@HunDunDM you're already a collaborator in bot's repo.

[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: 2550666

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
14 Code Smells

No Coverage information
2.9% Duplication

[HunDunDM]

/rebuild

[HunDunDM]

/run-integration-common-test

[codecov]

Codecov Report

Merging #3472 (2550666) into release-4.0 (d87a805) will decrease coverage by 0.05%.
The diff coverage is 50.00%.

@@               Coverage Diff               @@
##           release-4.0    #3472      +/-   ##
===============================================
- Coverage        74.77%   74.71%   -0.06%     
===============================================
  Files              210      210              
  Lines            19826    19831       +5     
===============================================
- Hits             14825    14817       -8     
- Misses            3666     3672       +6     
- Partials          1335     1342       +7     

Flag	Coverage Δ
unittests	74.71% <50.00%> (-0.06%)	⬇️

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

Impacted Files	Coverage Δ
server/core/region.go	91.74% <50.00%> (-0.64%)	⬇️
pkg/etcdutil/etcdutil.go	72.05% <0.00%> (-10.30%)	⬇️
server/kv/etcd_kv.go	69.56% <0.00%> (-10.15%)	⬇️
server/heartbeat_streams.go	65.93% <0.00%> (-6.60%)	⬇️
server/tso/tso.go	77.53% <0.00%> (-6.53%)	⬇️
server/member/leader.go	66.05% <0.00%> (-0.92%)	⬇️
server/server.go	73.34% <0.00%> (ø)
server/grpc_service.go	59.87% <0.00%> (+0.80%)	⬆️
server/cluster/cluster.go	78.93% <0.00%> (+0.82%)	⬆️
server/core/storage.go	68.39% <0.00%> (+0.86%)	⬆️
... and 2 more

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