[pallasathena92]

What this PR does

Plan Phase 1.4: runtime matching is rewritten as backend/internal/runtimeselect/, implementing OME's documented v1.3 selection rules, and exposed as POST /api/v1/runtimes/explain. internal/services/runtime_intelligence.go is deleted; the endpoints the deploy page still uses (/runtimes/compatible, /recommend, /:name/compatibility, /validate) are thin wrappers over the new package with their response shapes kept.

Rules, from the OME docs under reference/matching/ (each worked example is a test case): case-sensitive format and framework names; a version on one side only never matches; Equal (default), GreaterThan, GreaterThanOrEqual with the runtime's version as the bound and suffixed versions matching only on equality; architecture or quantization on one side only is a mismatch; every requested accelerator class must be in the runtime's acceleratorRequirements.acceleratorClasses; deployment mode from spec.deploymentMode and the component annotation; modelSizeRange bounds with M|B|T suffixes, unparsable values read as 0; score = max over autoSelect entries of (formatWeight + frameworkWeight) × priority with 0 meaning 10/5; namespaced before cluster runtimes, ties by size distance then name; disabled runtimes never selected. Inheritance (ome.io/inherit-from, depth 5, cycle detection, namespaced-then-cluster parent lookup) is resolved for a named runtime; auto-selection ranks unmerged specs like OME and kubectl.

POST /api/v1/runtimes/explain body: {namespace, model: <BaseModel spec> | {name, kind}, acceleratorClasses?, deploymentMode?}; response {items: [{runtime: {name, kind, namespace}, compatible, autoSelect, score, reasons[], exclusion?}]}, auto-selectable runtimes first in OME order, then compatible-but-named-only, then excluded ones with their exclusion. The README documents it.

Why we need it

The old matcher knew only format and framework names, scored on a scale OME does not use, and could not say why a runtime was excluded. The deploy form rewrite ranks runtimes with this endpoint and shows the reasons.

Deviations worth a look

• The legacy endpoints receive only format and framework names, so they match on names alone (entry versions, architecture and quantization stripped) to stay useful until the deploy page moves to explain; scores there are now OME scores (2, 6, 15...), which the current page renders with a % sign until it is rewritten.
• Scoring follows the docs' "versions included" wording: an entry with a version on one side only scores 0, where OME's scorer is more lenient. Corner case; the docs were taken as authoritative.
• explain's deploymentMode is applied to the engine; a decoder mode is only compared when an InferenceService has a decoder, which the request does not describe.
• /runtimes/validate lints against the selection rules instead of demanding a top-level containers list, which v1.3 runtimes do not have.

How to test

• cd backend && go vet ./... && go test -race -short ./... pass (runtimeselect: 1,220 lines of table tests covering every table and example in the five matching docs; handlers/runtimes_test.go runs the worked example through the routes with the fake clients).
• Against a cluster: curl -X POST localhost:8080/api/v1/runtimes/explain -d '{"namespace":"team-a","model":{"name":"llama-3-3-70b","kind":"ClusterBaseModel"}}' lists the same auto-selectable runtimes in the same order as kubectl ome runtime explain.

Checklist

• Tests added/updated (if applicable)
• Docs updated (if applicable)
• go test -race -short ./... passes locally (frontend untouched)

Summary by CodeRabbit

• New Features
  • Added an endpoint that explains runtime compatibility, rankings, scores, and exclusion reasons for a model.
  • Runtime recommendations now consider model requirements, deployment modes, accelerator classes, size ranges, and inherited runtime specifications.
• Bug Fixes
  • Compatibility checks now match format and framework names; named-runtime checks also resolve inherited specifications.
  • Configuration validation reports missing specifications and provides errors and warnings.
• Documentation
  • Updated API documentation for the explain and compatibility endpoints and clarified matching behavior.

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Files selected for processing: 2

• backend/internal/runtimeselect/inherit.go
• backend/internal/runtimeselect/inherit_test.go

Files skipped from review as they are similar to previous changes: 1

• backend/internal/runtimeselect/inherit.go

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Walkthrough

This change adds runtime-selection logic and a runtime explanation endpoint. It updates compatibility, recommendation, and validation endpoints to use the new logic, adds runtime inheritance support, and expands API documentation and tests.

Changes: Runtime Selection and API

Layer / File(s)	Summary
Selection data and inheritance backend/internal/runtimeselect/types.go, backend/internal/runtimeselect/decode.go, backend/internal/runtimeselect/inherit.go, backend/internal/runtimeselect/*_test.go	Adds runtime and model data types, unstructured-object decoders, and inheritance resolution that merges runtime specs and reports lookup or chain errors.
Matching and selection rules backend/internal/runtimeselect/filter.go, backend/internal/runtimeselect/match.go, backend/internal/runtimeselect/version.go, backend/internal/runtimeselect/score.go, backend/internal/runtimeselect/size.go, backend/internal/runtimeselect/validate.go, backend/internal/runtimeselect/*_test.go	Adds runtime matching, deployment-mode and accelerator filtering, version and size handling, scoring, and configuration validation, with tests for these rules.
Candidate evaluation and ranking backend/internal/runtimeselect/rank.go, backend/internal/runtimeselect/rank_test.go	Adds candidate evaluation and ranking by selection tier, runtime kind, score, size distance, name, and namespace.
Runtime explanation endpoint backend/internal/api/server.go, backend/internal/handlers/runtimes.go, backend/internal/handlers/runtimes_test.go	Registers POST /api/v1/runtimes/explain. The handler resolves model input, lists runtimes, and returns ranked candidates.
Compatibility, recommendation, and validation APIs backend/internal/handlers/runtimes.go, backend/internal/handlers/errors.go, backend/internal/handlers/errors_test.go, backend/internal/services/runtime_intelligence.go, backend/internal/handlers/runtimes_test.go, README.md	Moves existing runtime endpoints to local matching and validation logic, updates no-compatible-runtime error handling, removes the previous intelligence service, and documents API behavior.

Priority: Normal

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant RuntimesHandler
  participant KubernetesClient
  participant runtimeselect
  Client->>RuntimesHandler: POST /api/v1/runtimes/explain
  RuntimesHandler->>KubernetesClient: Resolve model and list runtimes
  KubernetesClient-->>RuntimesHandler: Model and runtime objects
  RuntimesHandler->>runtimeselect: Explain candidates
  runtimeselect-->>RuntimesHandler: Ranked candidates
  RuntimesHandler-->>Client: Explanation response

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Merge Risk: Minimal · up to 69cc1

The inheritance-scope issue appears addressed, and no remaining issue is established for this change. Mergeable after normal checks.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 60.19% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 108 functions across 25 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title "[Backend] Rewrite runtime matching to the v1.3 selection rules" matches the main change. The PR replaces the runtime matching logic with a new runtimeselect package that implements OME's v1…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Explanation

The title "[Backend] Rewrite runtime matching to the v1.3 selection rules" matches the main change. The PR replaces the runtime matching logic with a new runtimeselect package that implements OME's v1.3 selection rules, and it adds the explain endpoint. The title is specific and concise. It does not mention the new explain endpoint or the removal of runtime_intelligence.go, but the PR objectives treat those as supporting changes.

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Actionable comments posted: 1

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Prompt to fix review comments

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Inline comments:
Review comments at @backend/internal/runtimeselect/inherit.go:
- Line 49: Update `findParent` to return the scope kind that matched the parent,
and update `Resolve` to use it; after a `KindClusterServingRuntime` match, set
the subsequent lookup scope to `KindClusterServingRuntime` with an empty
namespace. Add a regression test ensuring a `ServingRuntime` →
`ClusterServingRuntime` → namespaced `ServingRuntime` chain is not accepted.

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Commits

Reviewing files that changed from the base of the PR and between 0d0748b and 6a18ce4.

Files selected for processing: 27

• README.md
• backend/internal/api/server.go
• backend/internal/handlers/errors.go
• backend/internal/handlers/errors_test.go
• backend/internal/handlers/runtimes.go
• backend/internal/handlers/runtimes_test.go
• backend/internal/runtimeselect/decode.go
• backend/internal/runtimeselect/decode_test.go
• backend/internal/runtimeselect/filter.go
• backend/internal/runtimeselect/filter_test.go
• backend/internal/runtimeselect/helpers_test.go
• backend/internal/runtimeselect/inherit.go
• backend/internal/runtimeselect/inherit_test.go
• backend/internal/runtimeselect/match.go
• backend/internal/runtimeselect/match_test.go
• backend/internal/runtimeselect/rank.go
• backend/internal/runtimeselect/rank_test.go
• backend/internal/runtimeselect/score.go
• backend/internal/runtimeselect/score_test.go
• backend/internal/runtimeselect/size.go
• backend/internal/runtimeselect/size_test.go
• backend/internal/runtimeselect/types.go
• backend/internal/runtimeselect/validate.go
• backend/internal/runtimeselect/validate_test.go
• backend/internal/runtimeselect/version.go
• backend/internal/runtimeselect/version_test.go
• backend/internal/services/runtime_intelligence.go

Files with no reviewable changes: 1

• backend/internal/services/runtime_intelligence.go

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