refactor: update helm config to new format

[evacchi]

What does this PR do?

Updates helm charts and docs to follow the config changes in #378. Stacked, pending merge there, and also cross-testing on llm-d-batch-gateway. Relevant commit is just 2b579b0

Why is this change needed?

#378 harmonizes configuration style for llm-d-async, this propagates the change to the Helm charts. The old Helm format still works, and also the old flags work for the time being. In v+2 we will remove the deprecated formats.

How was this tested?

• Unit tests added/updated
• Integration/e2e tests added/updated
• Manual testing performed

Checklist

• Commits are signed off (git commit -s) per DCO
• Code follows project contributing guidelines
• Tests pass locally (make test)
• Linters pass (make lint)
• Documentation updated (if applicable)

Related Issues

Follow up to #378, closes #284

Release note

Breaking: The Helm chart now configures the processor through the unified transport
surface. Select the backend with `ap.transport`
(`redis-pubsub` | `redis-sortedset` | `gcp-pubsub`) and configure it with a
single `ap.transportConfig` document (mirroring `--transport` /
`--transport-config`). Redis/Valkey credentials still come from `ap.redis.url`
or `ap.redis.secretName` (injected as `REDIS_URL`); leave `url` out of
`ap.transportConfig` to use them.

The deprecated per-backend values (`ap.messageQueueImpl`, the `ap.redis.*` /
`ap.gcpPubSub.*` request/queue fields, and `ap.otel.redisTracing`) still work —
the chart translates them into the transport config — and the install notes
print a migration warning when they are used. Either way the chart now emits
only `--transport` / `--transport-config`, so a default install no longer logs
per-flag deprecation warnings from the processor.

Deprecation Window: 2 versions from now.

[Copilot]

Pull request overview

Updates the llm-d-async Helm chart, E2E fixtures, and docs to align with the unified transport configuration surface introduced in #378, so the chart emits only --transport / --transport-config (while still translating deprecated per-backend values for compatibility).

Changes:

• Refactors the Helm chart to select/configure backends via ap.transport + ap.transportConfig, and synthesizes transport config from deprecated values when used.
• Updates Helm unit tests and E2E values/manifest fixtures to the new transport config format.
• Updates documentation and adds a Redis config-loading regression test; adds a release note entry.

Reviewed changes

Copilot reviewed 31 out of 31 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
test/e2e/yaml/llm-d-async-quota.yaml	Switches E2E manifest args to --transport / inline --transport-config.
test/e2e/yaml/llm-d-async-composite.yaml	Switches E2E manifest args to unified transport config (including poll interval).
test/e2e/helm/tier-priority.yaml	Updates Helm E2E values to ap.transport / ap.transportConfig format.
test/e2e/helm/short-drain.yaml	Updates Helm E2E values to unified transport surface.
test/e2e/helm/saturation.yaml	Updates Helm E2E values to unified transport surface; keeps metrics/redis blocks.
test/e2e/helm/redis-gate.yaml	Updates Helm E2E values to unified transport surface for a Redis gate case.
test/e2e/helm/quota.yaml	Updates Helm E2E values to unified transport surface for quota gating.
test/e2e/helm/prometheus-query.yaml	Updates Helm E2E values to unified transport surface for prometheus-query gating.
test/e2e/helm/multitenant.yaml	Updates multitenant Helm E2E values to unified transport config.
test/e2e/helm/mt-merge.yaml	Updates mt-merge Helm E2E values to unified transport config.
test/e2e/helm/integration.yaml	Updates integration Helm E2E values to unified transport config.
test/e2e/helm/endpoint-scrape.yaml	Updates endpoint-scrape Helm E2E values to unified transport config.
test/e2e/helm/composite.yaml	Updates composite gating Helm E2E values to unified transport config.
test/e2e/helm/budget.yaml	Updates budget gate Helm E2E values to unified transport config.
test/e2e/helm/benchmark.yaml	Updates benchmark Helm E2E values to unified transport config.
test/e2e/helm/benchmark-pool-gate.yaml	Updates benchmark pool gating Helm E2E values to unified transport config.
release-notes.d/unreleased/388.md	Adds release note describing the Helm chart transport-config migration and deprecations.
pkg/redis/options_test.go	Adds regression test ensuring REDIS_URL is a default (doesn’t override explicit config URL).
docs/guides/e2e-deploy/llm-d-async-values.yaml	Updates the guide’s example values to the unified transport surface (including urlSecret).
docs/guides/e2e-deploy.md	Updates narrative instructions to match new Helm values and secret handling.
charts/llm-d-async/values.yaml	Documents new ap.transport/ap.transportConfig and marks legacy blocks deprecated.
charts/llm-d-async/tests/validation_test.yaml	Adds Helm unittest coverage for new fail-fast transport validation.
charts/llm-d-async/tests/redis_secret_test.yaml	Adds Helm unittest coverage for transportConfig/legacy Redis Secret creation behavior.
charts/llm-d-async/tests/observability_test.yaml	Updates test defaults to satisfy new fail-fast validation via minimal transport config.
charts/llm-d-async/tests/deprecated_transport_test.yaml	Adds Helm unittest coverage ensuring legacy values translate to unified transport args (no retired flags).
charts/llm-d-async/tests/deployment_test.yaml	Updates and expands deployment unit tests around unified transport args and REDIS_URL injection.
charts/llm-d-async/templates/redis-secret.yaml	Refactors Redis Secret creation to support new transportConfig.urlSecret.url path.
charts/llm-d-async/templates/NOTES.txt	Adds install notes describing unified transport surface and migration warnings for deprecated values.
charts/llm-d-async/templates/ap-deployments.yaml	Implements fail-fast validation + emits unified --transport / --transport-config args only.
charts/llm-d-async/templates/ap-configmap.yaml	Removes Pub/Sub topics config file rendering (topics now inline in transport config).
charts/llm-d-async/templates/_helpers.tpl	Adds transport selection + legacy synthesis helpers and URL-secret resolution helpers.

Suppressed comments (1)

charts/llm-d-async/templates/_helpers.tpl:188

• In llm-d-async.redisSecretKey, if a user sets ap.transportConfig.urlSecret.name with an explicitly empty key (key: ""), the helper renders an empty secretKeyRef.key, producing an invalid Deployment. Treat empty as "url" (same as the "omitted" behavior).

{{- if and .Values.ap.transport (dig "urlSecret" "url" "" $ts) -}}
url
{{- else if and .Values.ap.transport (dig "urlSecret" "name" "" $ts) -}}
{{- dig "urlSecret" "key" "url" $ts -}}
{{- else if .Values.ap.redis.url -}}

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[evacchi]

rebased/force-pushed