// mark one connection as having disconnected.
	r.RegisterDisconnect(connections[2], sets.New[xds.EventType](""))
	// build a report, which should have only two dataplanes, with 50% acking v2 of config
	rpt, prunes := r.buildReport()
	r.removeCompletedResource(prunes)
	Expect(rpt.DataPlaneCount).To(Equal(2))
	Expect(rpt.InProgressResources).To(Equal(map[string]int{
		myResources[0].String(): 2,
		myResources[1].String(): 1,

 */
public class VariantIdentityUniquenessVerifier {

    /**
     * Build a report of all possible variant uniqueness failures for the given configurations.
     */
    public static VerificationReport buildReport(ConfigurationsProvider configurations) {
        ListMultimap<VariantIdentity, ConfigurationInternal> byIdentity =
            MultimapBuilder.linkedHashKeys().arrayListValues().build();