feat(helm): add UI HTTPRoute

[younsl]

Summary

Adds an optional Gateway API HTTPRoute for the UI. It is off by default so existing installs are unaffected.

• ui.httpRoute: lets users front the UI with a Gateway API implementation such as kgateway or Istio or Envoy Gateway instead of the OpenShift Route or the bundled oauth2-proxy.

Changes

HTTPRoute (ui.httpRoute)

• New template templates/ui-httproute.yaml gated behind ui.httpRoute.enabled (default false).
• Supports parentRefs and hostnames and per-rule matches / filters / timeouts.
• When a rule omits backendRefs it defaults to the UI Service on ui.service.ports.port.

{{- if .Values.ui.httpRoute.enabled }}
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
...
{{- end }}

Testing

Added helm-unittest suite tests/ui-httproute_test.yaml.

helm unittest helm/kagent

References

• Kubernetes Gateway API concept: https://kubernetes.io/docs/concepts/services-networking/gateway/
• Gateway API project docs: https://gateway-api.sigs.k8s.io/
• HTTPRoute resource: https://gateway-api.sigs.k8s.io/api-types/httproute/

Notes

• No change to existing rendered output when ui.httpRoute.enabled stays at its default.

[Copilot]

Pull request overview

This PR extends the helm/kagent chart with two opt-in features: (1) a Gateway API HTTPRoute for exposing the UI via a Gateway implementation, and (2) extraObjects, a tpl-rendered list for shipping arbitrary additional manifests with the release.

Changes:

• Adds ui.httpRoute values and a new templates/ui-httproute.yaml to render an optional UI HTTPRoute.
• Adds extraObjects values and a new templates/extra-objects.yaml to render arbitrary, tpl-expanded manifests.
• Adds helm-unittest coverage for both new templates.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
helm/kagent/values.yaml	Adds configuration for ui.httpRoute and top-level extraObjects.
helm/kagent/templates/ui-httproute.yaml	New optional Gateway API HTTPRoute template for the UI.
helm/kagent/templates/extra-objects.yaml	New template to render user-provided extraObjects via tpl.
helm/kagent/tests/ui-httproute_test.yaml	Unit tests validating HTTPRoute rendering behavior.
helm/kagent/tests/extra-objects_test.yaml	Unit tests validating extraObjects rendering behavior (map + string).

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[EItanya]

Hey there, I think there are a mixture of concerns here that I'd like to tease apart.

1. The HTTPRoute seems generally useful and I'd like to discuss the pros/cons
2. The arbitrary extra objects is unrelated and should be split up into a separate PR to debate on its own merit

[younsl]

Thanks for the review. Agreed on splitting these up. This PR now only contains the HTTPRoute change. I dropped the extraObjects commit and will open a separate PR for it so it can be debated on its own merit. Happy to discuss the pros and cons of the HTTPRoute here.