grafana: add some metrics about bucket

[bufferflies]

What problem does this PR solve?

add some metrics

Issue Number: Close #5068

What is changed and how does it work?

Check List

Tests

scheduler

heartbeat

heatbeat distribute

• Manual test (add detailed scripts or steps below)

Code changes

Side effects

Related changes

• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HunDunDM
• lhy1024

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[bufferflies]

/run-monitor-test

[sre-bot]

Visit the grafana server at: http://172.16.5.5:31013, it will last for 5 hours

[codecov]

Codecov Report

Merging #5069 (9b908c4) into master (52dd587) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5069      +/-   ##
==========================================
- Coverage   75.59%   75.45%   -0.14%     
==========================================
  Files         308      308              
  Lines       30378    30378              
==========================================
- Hits        22963    22922      -41     
- Misses       5432     5460      +28     
- Partials     1983     1996      +13     

Flag	Coverage Δ
unittests	75.45% <ø> (-0.14%)	⬇️

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

Impacted Files	Coverage Δ
pkg/tempurl/tempurl.go	45.00% <0.00%> (-15.00%)	⬇️
server/tso/local_allocator.go	64.86% <0.00%> (-13.52%)	⬇️
server/id/id.go	76.19% <0.00%> (-9.53%)	⬇️
pkg/cache/lru.go	79.06% <0.00%> (-9.31%)	⬇️
server/election/lease.go	84.05% <0.00%> (-4.35%)	⬇️
server/storage/hot_region_storage.go	78.14% <0.00%> (-3.28%)	⬇️
server/tso/allocator_manager.go	60.56% <0.00%> (-2.83%)	⬇️
server/schedule/labeler/rules.go	87.50% <0.00%> (-2.28%)	⬇️
server/config/persist_options.go	92.00% <0.00%> (-1.82%)	⬇️
server/region_syncer/client.go	84.32% <0.00%> (-1.50%)	⬇️
... and 16 more

---

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[bufferflies]

/merge

[ti-chi-bot]

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

/run-all-tests

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

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

Commit hash: 9b908c4

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #5082.