Roll out new unified standards to all Flux controllers

[scottrigby]

• Part of Define and unify Flux controller standards #1602
• Depends on Document runtime package and APIs, provide additional helpers pkg#117
• Depends on Document abstract outline of package in fluxcd/pkg/runtime directory pkg#118

Status

Now that fluxcd/pkg#101 is merged, people who have already contributed to Flux controllers built on controller-runtime (and have sufficient knowledge of K8s API conventions) can already start. Until fluxcd/pkg#117 is merged, we can do this on other controllers by pinning that PR branch from the source controller (refactor-reconcilers), and then after merge change back to main, and when available, to a tagged revision post-merge.

Tasks

In PRIORITY order, with linked issues/PRs where applicable, and current status:

• Update kustomize-controller to new unified standards 🎉 (Roll out new unified standards to Kustomize Controller kustomize-controller#663)
• source-controller https://github.com/fluxcd/flux2/issues/1679 🙂 (Implement helpers from pkg/runtime source-controller#361)
• helm-controller Update helm-controller to new unified standards helm-controller#303 in progress ⏳
• Update image-automation-controller to new unified standards
• Update image-reflector-controller to new unified standards
• Update notification-controller to new unified standards

Nice to have:

• Update Example controller to new unified standards #1625 on hold 🚫

[hiddeco]

RC releases for all relevant packages have been published:

Package	Version	Reference
github.com/fluxcd/pkg/apis/kustomize	v0.3.0-rc.1	Link
github.com/fluxcd/pkg/apis/meta	v0.11.0-rc.1	Link
github.com/fluxcd/pkg/runtime	v0.13.0-rc.5	Link

[makkes]

@hiddeco the only remaining open task is closed. Can we close this issue then, too?

[stefanprodan]

We've reshaped the roadmap to be about gradually promoting features and APIs to stable (GA). I'm closing this umbrella issue as it tracks things globally, we're now using milestones to track GA per featureset.