I have a new workspace and usage metrics apear only for some reports. In more detail when a report is using as data source a dataset of the same workspace usage metrics do notapear. This is not coold because if a dataset is created once and is maintained only via one report it can be reused in other reports. However if you do nto get usage stats then is ind of not cool.
While if you want to get usage stats you should maintain different daatsets even if they are the same.