Proposal: support cold memory collect and report

[BUPT-wxq]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.12% 🎉

Comparison is base (e860f15) 64.77% compared to head (a935e73) 64.90%.
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1514      +/-   ##
==========================================
+ Coverage   64.77%   64.90%   +0.12%     
==========================================
  Files         347      349       +2     
  Lines       35365    35950     +585     
==========================================
+ Hits        22908    23333     +425     
- Misses      10774    10895     +121     
- Partials     1683     1722      +39     

Flag	Coverage Δ
unittests	64.90% <ø> (+0.12%)	⬆️

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see 23 files with indirect coverage changes

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[saintube]

/lgtm
/cc @zwzhang0107 @hormes @eahydra @jasonliu747 @FillZpp @ZiMengSheng PTAL

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/lgtm
/cc @zwzhang0107 @hormes @eahydra @jasonliu747 @FillZpp @ZiMengSheng PTAL

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[hormes]

/lgtm

[saintube]

@BUPT-wxq As discussed in the bi-weekly meeting, please add a section Observability & Evaluation in the proposal, which describes the metrics about the benefits and overhead of the coldpgs.

[saintube]

/lgtm

[hormes]

/lgtm
/approve

[koordinator-bot]

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