*: add pending task metrics in runner and add templ

[nolouch]

What problem does this PR solve?

Issue Number: Ref #7897

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HuSharp
• rleungx

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.40%. Comparing base (44d57b6) to head (b35c0ce).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8138      +/-   ##
==========================================
- Coverage   77.44%   77.40%   -0.05%     
==========================================
  Files         471      471              
  Lines       61348    61356       +8     
==========================================
- Hits        47510    47490      -20     
- Misses      10278    10304      +26     
- Partials     3560     3562       +2     

Flag	Coverage Δ
unittests	77.40% <100.00%> (-0.05%)	⬇️

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[ti-chi-bot]

PR needs rebase.

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[nolouch]

/merge

[ti-chi-bot]

@nolouch: 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: b35c0ce