Modify Prow Services to insert `app.kubernetes.io` labels to objects it creates in Kubernetes

[upodroid]

What would you like to be added: I'm rebuilding the knative prow cluster from scratch and having a hard time figuring out it which objects are created by prow which ones were created by humans.

There are standard labels widely used with Kubernetes to supply more information about k8s objects.

https://kubernetes.io/docs/reference/labels-annotations-taints/#app-kubernetes-io-component

Why is this needed:

It is much easier to understand and see which objects are owned/created by prow and which particular prow service is creating it.

[upodroid]

/sig testing /area prow

[alvaroaleman]

Not sure if it is realistic to have this everywhere. You can use managedFields through something like kubectl blame or maybe even just check if the kubectl.kubernetes.io/last-applied-configuration is present if you just want to know "Was this created by kubectl or something else".

[sftim]

I like the idea of documenting this as good practice, even if we never 100% achieve that desired state.

[k8s-triage-robot]

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/lifecycle stale

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/lifecycle rotten

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

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• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Reopen this issue with /reopen
• Mark this issue as fresh with /remove-lifecycle rotten
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/close not-planned

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