PageStorage V3 GC add metrics.

[jiaqizho]

Signed-off-by: jiaqizho zhoujiaqi@pingcap.com

What problem does this PR solve?

Issue Number: ref #3594

Problem Summary:

What is changed and how it works?

to enable Page GC Tasks OPM and Page GC Tasks Duration.

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:

• CalvinNeo
• JaySon-Huang

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[JaySon-Huang]

I'd like to add two more metrics:
Add new metrics PSMForegroundWriteBytes and PSMForegroundReadBytes (for both V2 and V3) that whether the write/read comes from the upper layer. By checking these metrics, we can tell whether the background GC write/read flow is as expected or not.

[JaySon-Huang]

lgtm

[CalvinNeo]

LGTM

[jiaqizho]

/merge

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

Commit hash: 2651ca3

[sre-bot]

Coverage for changed files

Filename                                 Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Common/TiFlashMetrics.h                       18                 0   100.00%          11                 0   100.00%          47                 1    97.87%           8                 0   100.00%
Storages/Page/V3/BlobStore.cpp               374               113    69.79%          39                 3    92.31%         818               209    74.45%         240                90    62.50%
Storages/Page/V3/PageStorageImpl.cpp          87                25    71.26%          21                 7    66.67%         204                65    68.14%          46                24    47.83%
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                        479               138    71.19%          71                10    85.92%        1069               275    74.28%         294               114    61.22%

Coverage summary

Functions  MissedFunctions  Executed  Lines   MissedLines  Cover
17069      9589             43.82%    192097  97192        49.40%

full coverage report (for internal network access only)