Addon Discovery PoC

[njhale]

Overview

This is an attempt to port the addon discovery PoC demoed at the working group before the holidays. The primary goal is to see if we like this approach for tracking addon state.

Summary

addon-discovery identifies a cluster addon as a set of component Kubernetes resources selected by a label unique to that addon. It introduces a cluster-scoped Addon resource that surfaces:

• info about the addon
• the label selector used to gather its components
• a set of status enriched references to its components
• top-level conditions that summarize any abnormal state (Future Work)

Similar Operators

SIG Apps has an Application CRD with some overlapping features. A demo of addon-discovery to the SIG didn't produce strong feedback against or for. A follow-up is pending.

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[njhale]

/remove-lifecycle stale

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[k8s-ci-robot]

@fejta-bot: Closed this PR.

In response to [this](https://github.com/kubernetes-sigs/cluster-addons/pull/37#issuecomment-712629163): >Rotten issues close after 30d of inactivity. >Reopen the issue with `/reopen`. >Mark the issue as fresh with `/remove-lifecycle rotten`. > >Send feedback to sig-testing, kubernetes/test-infra and/or [fejta](https://github.com/fejta). >/close Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.