[Fix] Log message for selected clusters in karmada-scheduler is unreadable

[ARRY7686]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:
This PR enhances the logging for selected clusters in the generic scheduler. It introduces detailed cluster summaries in the log output when the verbosity level is high, improving the traceability and debuggability of scheduling operations.

Which issue(s) this PR fixes:

Fixes #6880

Special notes for your reviewer:

• Added more comprehensive log messages for selected clusters.
• Helps developers trace scheduling behavior during high verbosity debugging sessions.

Does this PR introduce a user-facing change?:

Enhance logging for selected clusters in the generic scheduler, adding detailed cluster summaries when verbosity level is high.

[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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• pkg/scheduler/OWNERS

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[karmada-bot]

Welcome @ARRY7686! It looks like this is your first PR to karmada-io/karmada 🎉

[gemini-code-assist]

Summary of Changes

Hello @ARRY7686, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the logging capabilities within the karmada-scheduler's generic scheduler component. The primary goal is to make the log output for selected clusters more informative and readable. By introducing detailed summaries that include cluster names, scores, and available replicas at a higher verbosity level, the change aims to provide developers with better insights into scheduling decisions, thereby improving the overall debugging experience and operational understanding of the system.

Highlights

• Improved Log Readability: The pull request addresses an issue where log messages for selected clusters in the karmada-scheduler were unreadable, making debugging difficult.
• Detailed Cluster Summaries: When the verbosity level is set to V(4), the logs now include detailed summaries for each selected cluster, showing its name, score, and available replicas.
• Enhanced Debuggability: This change significantly improves the traceability and debuggability of scheduling operations by providing more comprehensive information directly in the logs.

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[gemini-code-assist]

Code Review

The pull request improves the logging for selected clusters in the generic scheduler by providing more detailed cluster summaries when the verbosity level is high. This enhances traceability and debuggability of scheduling operations. The changes are well-implemented and address the issue effectively.

[Copilot]

Pull Request Overview

This PR enhances the logging of selected clusters in the scheduler by providing more detailed information. Instead of simply logging the cluster objects, the code now formats the output to include cluster name, score, and available replicas in a more readable format.

• Enhanced cluster selection logging to include structured details (name, score, available replicas)
• Added performance optimization by checking log level before formatting expensive log strings
• Added strings import to support the new formatting logic

---

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[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 46.38%. Comparing base (4b5aa6b) to head (2581ec5).

Files with missing lines	Patch %	Lines
pkg/scheduler/core/generic_scheduler.go	0.00%	1 Missing ⚠️
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6904   +/-   ##
=======================================
  Coverage   46.38%   46.38%           
=======================================
  Files         697      697           
  Lines       47751    47751           
=======================================
+ Hits        22149    22150    +1     
+ Misses      23933    23932    -1     
  Partials     1669     1669           

Flag	Coverage Δ
unittests	46.38% <0.00%> (+<0.01%)	⬆️

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[karmada-bot]

Adding label do-not-merge/contains-merge-commits because PR contains merge commits, which are not allowed in this repository.
Use git rebase to reapply your commits on top of the target branch. Detailed instructions for doing so can be found here.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[RainbowMango]

@ARRY7686 Can you look at the failing lint warning? And you might need to rebase your code to get rid of the merge commit.
You can do that by following the commands:

- git fetch upstream
- git rebase upstream/master
- git push origin fix-logger-readability -f 

And after that, you need to squash commits.

[ARRY7686]

thanks so much for the help I will look into it