feat: add orphaned resource count metric #6391

[jaehanbyun]

Closes: #6391

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Toolchain Guide
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
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• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
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• Optional. My organization is added to USERS.md.
• Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

What I have done:

For issue #6391, I have added a metric that indicates the count of orphaned resources for each application. This new metric is called argocd_app_orphaned_resources_count{label...} and tracks the number of orphaned resources per application.

Metric Output:

[bunnyshell]

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[ishitasequeira]

Thanks @jaehanbyun !! The overall change looks good!!

[jaehanbyun]

Hi @ishitasequeira, Auto merge did not execute properly. Could you please check?
Thanks!

[ishitasequeira]

Hi @ishitasequeira, Auto merge did not execute properly. Could you please check?

Thanks!

Looks like the tests failed. I will try rerunning the tests.

[jaehanbyun]

Hello @ishitasequeira,

Could you please rerun the tests when you have a moment? Let me know if you need anything else. Thank you!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (master@ea46572). Learn more about missing BASE report.
Report is 65 commits behind head on master.

Additional details and impacted files

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  Coverage          ?   55.14%           
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  Files             ?      324           
  Lines             ?    55122           
  Branches          ?        0           
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  Hits              ?    30399           
  Misses            ?    22107           
  Partials          ?     2616           

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[jaehanbyun]

Hi @ishitasequeira,

I have resolved the test failures. Could you please re-enable auto-merge?
Thank you!