Add ORCA implementation based on stats API

[Matts966]

Description

READ

WRITE

Related Issue

Versions

• Vald Version: v1.7.17
• Go Version: v1.26.1
• Rust Version: v1.94.1
• Docker Version: v29.3.1
• Kubernetes Version: v1.35.3
• Helm Version: v4.1.3
• NGT Version: v2.7.2
• Faiss Version: v1.14.1

Checklist

• I have read the CONTRIBUTING document and completed our CLA agreement.
• I have checked open Pull Requests for the similar feature or fixes?

Special notes for your reviewer

[cloudflare-workers-and-pages]

Deploying vald with    Cloudflare Pages

Latest commit:	76c99bc
Status:	✅  Deploy successful!
Preview URL:	https://ae0e76d8.vald.pages.dev
Branch Preview URL:	https://feature-gateway-orca.vald.pages.dev

View logs

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

🗂️ Base branches to auto review (1)

• main

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 3e11aa29-bb90-4add-ac66-b768acb02d01

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/gateway/orca

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[vdaas-ci]

[WARNING:INTCFG] Changes in internal/config may require you to change Helm charts. Please check.

[codecov]

Codecov Report

❌ Patch coverage is 32.91925% with 108 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.26%. Comparing base (5e042b9) to head (76c99bc).

Files with missing lines	Patch %	Lines
pkg/gateway/lb/service/orca.go	45.71%	55 Missing and 2 partials ⚠️
pkg/gateway/lb/service/gateway.go	0.00%	24 Missing ⚠️
pkg/gateway/lb/service/option.go	0.00%	16 Missing ⚠️
pkg/gateway/lb/usecase/vald.go	0.00%	6 Missing ⚠️
pkg/gateway/lb/handler/grpc/object.go	0.00%	4 Missing ⚠️
pkg/gateway/lb/handler/grpc/aggregation.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                              Coverage Diff                              @@
##           feature/gateway/add-resource-stats-detail    #3541      +/-   ##
=============================================================================
- Coverage                                      26.98%   26.26%   -0.73%     
=============================================================================
  Files                                            530      575      +45     
  Lines                                          49217    50779    +1562     
=============================================================================
+ Hits                                           13281    13336      +55     
- Misses                                         34955    36460    +1505     
- Partials                                         981      983       +2     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.