Metrics of threads

[bestwoody]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

What is changed and how it works?

new metrics:
    rpc: dispatch_mpp, establish_mpp
    threadpool: total, active
    threadfactory: total(active)

example: http://172.16.100.2:16205/d/SVbh2xUWk/woody-remote3-tiflash-summary?var-tidb_cluster=&var-instance=All. (Kongsoft Cloud)

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• windtalker
• yibin87

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[ti-chi-bot]

[FORMAT CHECKER NOTIFICATION]

Notice: To remove the do-not-merge/needs-linked-issue label, please provide the linked issue number on one line in the PR body, for example: Issue Number: close #123 or Issue Number: ref #456.

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[yibin87]

LGTM

[windtalker]

LGTM

[bestwoody]

/merge

[ti-chi-bot]

@bestwoody: 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: 6449e14

[sre-bot]

Coverage for changed files

Filename                         Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Common/DynamicThreadPool.cpp          79                 1    98.73%          10                 0   100.00%          96                 1    98.96%          24                 1    95.83%
Common/Stopwatch.h                    32                11    65.62%          22                 7    68.18%          72                38    47.22%           6                 4    33.33%
Common/ThreadFactory.h                16                 0   100.00%           2                 0   100.00%          18                 0   100.00%           2                 1    50.00%
Common/TiFlashMetrics.h               18                 0   100.00%          11                 0   100.00%          47                 1    97.87%           8                 0   100.00%
Flash/Mpp/MPPTunnel.cpp              144               144     0.00%          14                14     0.00%         189               189     0.00%          64                64     0.00%
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                289               156    46.02%          59                21    64.41%         422               229    45.73%         104                70    32.69%

Coverage summary

Functions  MissedFunctions  Executed  Lines   MissedLines  Cover
16691      9456             43.35%    186850  95552        48.86%

full coverage report (for internal network access only)