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It could be useful in case one wants to evaluate how many vms he can run in each cluster/data center before actually creating the vms and without manually summing this information which available in each host separately. It could be a sub-tab in cluster level or/and data center level. It does not require any backend implementation since all the needed data is already available.
Closing old bugs. If this issue is still relevant/important in current version, please re-open the bug.