Remove kubectl run generators

[soltysh]

What type of PR is this?
/kind api-change
/kind cleanup
/kind deprecation
/priority backlog
/sig cli

What this PR does / why we need it:
Over a year ago we've deprecated all the generators from under kubectl run command except for the one responsible for generating a pod (see #68132).
This PR removes all the generators and deprecates all the flags towards the goal to make kubectl run simpler.

Special notes for your reviewer:
/assign @liggitt @seans3 @pwittrock

Does this PR introduce a user-facing change?:

Remove all the generators from kubectl run. It will now only create pods. Additionally, deprecates all the flags that are not relevant anymore.

/cc @kubernetes/sig-cli-api-reviews @kubernetes/sig-cli-pr-reviews

[soltysh]

/hold
for visibility

[soltysh]

/sig architecture
@kubernetes/sig-architecture-api-reviews since this is dropping a few of conformance tests

[liggitt]

I'm surprised we had a conformance test using deprecated function... that shouldn't really have happened

[soltysh]

yeah, my bad I didn't catch it earlier 😞

[soltysh]

/retest

[sftim]

Does this need an issue to remove / revise documentation about generators from the website?
(there might be one already)

[sftim]

Thinking about this, any website page that recommends using kubectl run will need to change. There might be some left.

[soltysh]

Does this need an issue to remove / revise documentation about generators from the website?
(there might be one already)

Yes, docs pr will follow.

[NinjaPanda91]

Can we revert this PR ?
--port, --replicas flags and a bunch of flags are missing and I'm studying for CKA exam and i just found out it uses 1.18.

We can raise this back once I'm done with the exam.

[sftim]

To be clear, the deprecation occurred in #68132 based on SIG CLI's consensus-based decision making.
If you'd like to enhance kubectl create, or to suggest enhancements, I feel that those suggestions are much more likely to be accepted.

[soltysh]

#91113 should solve the issue @alexellis hope this helps your case 😺

[alexellis]

Nice to have port back, what about the other key flags?

[sftim]

To suggest an enhancement for kubectl, you can visit https://github.com/kubernetes/kubectl/issues/new (and I hope that people will make these suggestions)

[supirman]

Can we revert this PR ?
--port, --replicas flags and a bunch of flags are missing and I'm studying for CKA exam and i just found out it uses 1.18.

We can raise this back once I'm done with the exam.

I was taking some Qwiklabs labs, some of kubertes lab rely on kubectl run. It seem that kubectl in Google Cloud Shell got update recently and the lab not updated to this issue.

For the workaround, you can just use the old version where kubectl run still working in old ways.

[tm1810]

kubectl run for deployments is being missed, can we get the features back in create please, this will make a lot of difference

[armujahid]

@tm1810 you can check kubernetes/kubectl#898