🔧 Chore: percentiles histogram 메트릭 추가

[strongmhk]

• 다중 서버 환경에서 더 정확하게 메트릭(p95, p99 등)을 측정

📄 PR 요약

✍🏻 PR 상세

👀 참고사항

✅ 체크리스트

• PR 양식에 맞게 작성했습니다.
• 모든 테스트가 통과했습니다.
• 프로그램이 정상적으로 작동합니다.
• 적절한 라벨을 설정했습니다.
• 불필요한 코드를 제거했습니다.

🚪 연관된 이슈 번호

Closes #{이슈 번호}

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch develop

Tip

📝 Customizable high-level summaries are now available in beta!

You can now customize how CodeRabbit generates the high-level summary in your pull requests — including its content, structure, tone, and formatting.

• Provide your own instructions using the high_level_summary_instructions setting.
• Format the summary however you like (bullet lists, tables, multi-section layouts, contributor stats, etc.).
• Use high_level_summary_in_walkthrough to move the summary from the description to the walkthrough section.

Example instruction:

"Divide the high-level summary into five sections:

1. 📝 Description — Summarize the main change in 50–60 words, explaining what was done.
2. 📓 References — List relevant issues, discussions, documentation, or related PRs.
3. 📦 Dependencies & Requirements — Mention any new/updated dependencies, environment variable changes, or configuration updates.
4. 📊 Contributor Summary — Include a Markdown table showing contributions:
   | Contributor | Lines Added | Lines Removed | Files Changed |
5. ✔️ Additional Notes — Add any extra reviewer context.
   Keep each section concise (under 200 words) and use bullet or numbered lists for clarity."

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