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42e32566f6
Lubos Kosco points out that on Microsoft Azure, for example, it is possible for the "zone metadata" (which we use as rack information) can be empty as shown in: https://docs.microsoft.com/en-us/azure/virtual-machines/windows/instance-metadata-service?tabs=windows#instance-metadata Therefore, protect against empty DC or rack strings in `production_snitch_base` to keep the behavior consistent across different snitches.