feat(t8s-cluster/management-cluster): enable ImageVolume feature flag

[cwrau]

Summary by CodeRabbit

Release Notes

• Bug Fixes

  • Fixed template syntax errors in cluster configuration templates to ensure proper rendering.

• New Features

  • Enhanced API server configuration with support for feature gates, including ImageVolume feature support for improved cluster functionality.
  • Feature gates are now configurable per component with automatic application to relevant services.

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[coderabbitai]

Walkthrough

Introduces feature gate handling for API server by computing component-specific feature gates and conditionally applying them to server arguments. Replaces placeholder feature gates mapping with concrete values for "apiserver" and "kubelet" components. Fixes template syntax errors in two template blocks.

Changes

Cohort / File(s)	Summary
Feature gate handling and template fixes charts/t8s-cluster/templates/management-cluster/clusterClass/_helpers.tpl	Adds feature-gates flag computation from t8s-cluster.featureGates.forComponent data for API server. Replaces empty featureGates placeholder with concrete mapping defining "ImageVolume" for apiserver and kubelet. Removes stray closing tokens in staticFiles and dynamicFiles template blocks.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

• Template logic verification: Ensure feature-gates computation correctly extracts and formats values from the featureGates.forComponent structure, particularly the conditional flag assembly logic.
• Syntax and template rendering: Verify that stray token removal and the modified template blocks render correctly without breaking Helm chart compilation.
• API server argument handling: Confirm that the feature-gates flag integrates properly with existing API server arguments and follows the same pattern as other components.

Poem

🐰 A rabbit hops through gates so fine,
Feature flags now in line,
Templates fixed with careful care,
API server's smooth affair! ✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: enabling the ImageVolume feature flag in the t8s-cluster management cluster, which aligns with the primary objective and the concrete feature gate mapping introduced in the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/t8s-cluster/enable-image-volume-feature

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 7c1bd9a and d1c04ce.

📒 Files selected for processing (1)

• charts/t8s-cluster/templates/management-cluster/clusterClass/_helpers.tpl (2 hunks)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (2)

• GitHub Check: Agent
• GitHub Check: lint helm chart (t8s-cluster)

🔇 Additional comments (2)

charts/t8s-cluster/templates/management-cluster/clusterClass/_helpers.tpl (2)

73-75: ImageVolume feature gate mapping looks consistent with intended components

Defining ImageVolume once and listing "apiserver" and "kubelet" as consumers is a clean central mapping and fits the forComponent helper usage.

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77-86: The review comment contains an incorrect assessment of the piping argument order

The review claims the arguments to has are reversed, but this analysis is incorrect.

Sprig's has function takes the needle first and the collection second, and when using a pipeline (|), the piped value becomes the last argument to the function.

In the current code {{- if $components | has $component -}}:

• $component is the explicit argument (placed first)
• $components is piped and becomes the last argument
• This results in: has($component, $components) — the correct order

For the apiserver use case:

• $component = "apiserver" (string)
• $components = ["apiserver", "kubelet"] (list from the feature gates definition)
• The condition correctly checks if "apiserver" exists in the list, which is true
• The feature gate is properly applied

The current implementation is correct and requires no changes.

Likely an incorrect or invalid review comment.

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[Copilot]

Pull Request Overview

This PR enables the ImageVolume Kubernetes feature gate for both the API server and kubelet components in the t8s-cluster management cluster configuration.

Key Changes:

• Activates the ImageVolume feature gate for apiserver and kubelet components through the centralized feature gate management system
• Implements feature gate command-line argument generation for the API server
• Leverages existing kubelet patch mechanism for kubelet feature gate configuration

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