Add KEP for DRA: Extended Resource

[yliaog]

• One-line PR description:
  Add new KEP for supporting extended resource requests in DRA

• Issue link:
  DRA: Handle extended resource requests via DRA Driver #5004

• Other comments:
  kubelet and scheduler for extended resource backed by DRA kubernetes#130653

[yliaog]

/assign @johnbelamaric

[johnbelamaric]

Awesome, thanks @yliaog

[pohly]

/cc

[pohly]

@yliaog: please squash into one commit and keep it like that when making further changes (i.e. amend the commit without rebasing). Then once it has approvals, we can merge directly.

We have LGTM from Sergey for SIG Node, preliminary API review by Jordan, approval from from @dom4ha for SIG Scheduling. I think all that is missing is PRR from @johnbelamaric (or some other PRR reviewer).

[yliaog]

Thanks @pohly, squashed all commits, and I think @johnbelamaric has already approved PRR, so the KEP is ready for merge.

[pohly]

It has John's approval, but it's not clear to me whether that was for PRR. Probably.

Let's hold for a bit longer, perhaps we can get clarification.

/lgtm

[pohly]

/wg device-management

[johnbelamaric]

/lgtm

[pohly]

Based on #5136 (comment), PRR is done.

@aojea had some recent comments, so let's keep the hold for another day before merging. @aojea: feel free to lift the hold immediately if your concerns have been addressed.

[aojea]

Based on #5136 (comment), PRR is done.

@aojea had some recent comments, so let's keep the hold for another day before merging. @aojea: feel free to lift the hold immediately if your concerns have been addressed.

commented here #5136 (comment) , non blocking comments, just raise awareness of the risks of having too much flexibility on a transition mechanism

I feel that providing much flexibility to a mechanism that should be only solving the migration from device plugins to dra drivers, can make the scope creeping and we end in a situation like python2 -> python3 or ipv4->ipv6 that nobody nevers moves from the legacy mechanism ... and even worse, people starts building features on top this duality

/hold cancel