feat: supports custom metrics sink export period and timeout

[ShyunnY]

What type of PR is this?

feat: supports custom metrics sink export period and timeout

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #3038

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 31 lines in your changes are missing coverage. Please review.

Project coverage is 67.15%. Comparing base (e847d68) to head (7144db9).
Report is 29 commits behind head on main.

Files	Patch %	Lines
internal/metrics/register.go	0.00%	31 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3103      +/-   ##
==========================================
- Coverage   67.41%   67.15%   -0.26%     
==========================================
  Files         166      166              
  Lines       19184    19463     +279     
==========================================
+ Hits        12932    13071     +139     
- Misses       5322     5447     +125     
- Partials      930      945      +15     

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[github-actions]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. Please feel free to give a status update now, ping for review, when it's ready. Thank you for your contributions!

[ShyunnY]

cc: @arkodg
When will we start reviewing this feature? I hope to use this feature in the near future. :)

[arkodg]

hey @ShyunnY are you running EG and hitting this issue around metric staleness ?

[ShyunnY]

hey @ShyunnY are you running EG and hitting this issue around metric staleness ?

If you only use the default 60s export time, you will encounter staleness problems in some cases (which is what we don't want to see), so we hope to have controllable configuration.

[shawnh2]

/retest

[shawnh2]

LGTM！

[shawnh2]

/retest