structured-merge-diff: Add presubmit job for structured merge diff API diff

[yongruilin]

Ref: kubernetes-sigs/structured-merge-diff#276

[yongruilin]

/cc @jpbetz
/cc @BenTheElder

Also, could we update the OWNERS file? I think lavalamp@ and jennybuckley@ should be moved to emeritus_approvers and nominate some active contributors?

[BenTheElder]

Also, could we update the OWNERS file? I think lavalamp@ and jennybuckley@ should be moved to emeritus_approvers and nominate some active contributors?

please do! send a PR, thanks!

[BenTheElder]

We can be less conservative with memory, I believe we have 8 core x 64gi hosts so ~~8 per vcpu (ignoring kubelet etc using some of both). We're rarely memory bound scheduling and tasks completing quicker (with more cache etc) is actually cheaper.

https://github.com/kubernetes/k8s.io/blob/86089ae44dd87d86fa1a2a651bb0d6f4ceb06270/infra/aws/terraform/prow-build-cluster/terraform.prod.tfvars#L39C32-L39C44

(on GCP we use n1-highmem-8 https://github.com/kubernetes/k8s.io/blob/86089ae44dd87d86fa1a2a651bb0d6f4ceb06270/infra/gcp/terraform/k8s-infra-prow-build/main.tf#L101)

I filed an issue to track documenting this better: #34139

[yongruilin]

So should I put it 16Gi instead?

[BenTheElder]

/lgtm
/approve
/hold

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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