flux: generic controller support

[cschindlbeck]

Problem

The Controllers section in Flux Checks was built on a hardcoded allowlist of pod label selectors covering only the six standard Flux controllers plus source-watcher. Any third-party controller deployed alongside Flux — such as terraform-runner-tofu-controller (Tofu/OpenTofu) — was silently omitted.

Additionally, the pod list was scoped to fluxCheck.namespace, which defaults to an empty string on non-bootstrapped clusters, causing Headlamp to fall back to listing pods across all namespaces.

Changes

• Switch from pods to deployments as the data source for the Controllers table. Deployments give a cleaner picture of intent (desired vs. ready replicas) compared to individual pod phase.
• Generic name-based filter: include any deployment in the flux namespace whose name contains controller or watcher. This picks up all standard Flux controllers, source-watcher, terraform-runner-tofu-controller, and any future additions without code changes.
• Namespace fix: scope the deployment list to fluxCheck.namespace || 'flux-system' so it never accidentally queries all namespaces on non-bootstrapped clusters.
• Health checks updated: useFluxHealth and the accordion status badge now compare readyReplicas === replicas instead of phase === 'Running'.
• Controllers table updated: name links to the deployment detail page, status column shows X/Y ready replicas, image path corrected to spec.template.spec.containers[0].image.

[Copilot]

Pull request overview

This PR updates the Flux plugin’s “Controllers” health and display logic to support third-party Flux-adjacent controllers by switching the Controllers data source from Pods to Deployments, and by using a generic controller/watcher name filter. It also aims to prevent unintended all-namespace queries on non-bootstrapped clusters.

Changes:

• Switched Controllers discovery from Pod listing to Deployment listing and filtered deployments by name containing controller/watcher.
• Updated health/readiness logic and UI to use deployment replica readiness instead of pod phase.
• Updated Controllers table to link to Deployment details and to display ready replica counts and the container image from the deployment template.

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[illume]

Please check the git commit message follows the format... something like:

flux: Support generic controllers in flux plugin within flux-system
...

[cschindlbeck]

@illume tested in the cluster, works. also changed commit message and implemented ghcp suggestions

[illume]

Awesome, thanks! 🎉