Expose Network Topology as attributes

[aojea]

In GKE this is also exposed on the node labels https://cloud.google.com/ai-hypercomputer/docs/workloads/schedule-gke-workloads-tas#understand-physical-topology

   cloud.google.com/gce-topology-block: 6b1ddbbd41cf397b9bcd1086091914e7
    cloud.google.com/gce-topology-host: b881b33e5fd8128f2e8b3ad50506ee87
    cloud.google.com/gce-topology-subblock: 88fba4b895a44590c026f7c1bf4c1695

This can be obtained via the metdata and is represented in the following format

VM-Position

RESOURCE_POLICIES: us-central1/resourcePolicies/example-policy']
PHYSICAL_HOST: /CCCCCCC/BBBBBB/AAAA

That IIRC https://cloud.google.com/ai-hypercomputer/docs/workloads/schedule-gke-workloads-tas#understand-physical-topology

block: CCCCCCC
subblock: BBBBBB
host: AAAA

https://cloud.google.com/compute/docs/instances/use-compact-placement-policies#verify-vm-location

The implementation is just to enhance the existing function

dranet/pkg/cloudprovider/gce/gce.go

Lines 105 to 120 in 9846f19

	// GetGCEAttributes fetches all attributes related to the provided GCP network.
	func GetGCEAttributes(network string) map[resourceapi.QualifiedName]resourceapi.DeviceAttribute {
	attributes := make(map[resourceapi.QualifiedName]resourceapi.DeviceAttribute)
	var projectNumber int64
	var name string
	// Use custom parsing because the network path is
	// different from the format expected by k8s-cloud-provider
	_, err := fmt.Sscanf(network, "projects/%d/networks/%s", &projectNumber, &name)
	if err != nil {
	klog.Warningf("Error parsing network %q : %v", network, err)
	return nil
	}
	attributes["gce.dra.net/networkName"] = resourceapi.DeviceAttribute{StringValue: &name}
	attributes["gce.dra.net/networkProjectNumber"] = resourceapi.DeviceAttribute{IntValue: &projectNumber}
	return attributes
	}

Bonus to create an example in the documentation of using dranet with Kueue https://cloud.google.com/ai-hypercomputer/docs/workloads/schedule-gke-workloads-tas#use-podgroup

[aojea]

@michaelasp this is another easy one to pick up

[michaelasp]

Sgtm, I can take a look.