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The ability to mass test credentials for data sources on Tableau Server is not yet built into the product but I see that this could be a very useful feature for such cases as what you have outlined above.
Please submit an Idea to the Ideas section of the forum : Ideas
There are several dashboards as well as views that can be used to review different aspects of the data sources such as traffic to the data source or the amount space being used for the extracted data sources.
Another option for more customized views, I would connect to the internal Postgre SQL db, then create a custom view reviewing the desired information.
Hope this helps!
Thanks Byrne, I managed to build a couple views that tell me enough information. Once I have them 'production' ready i'll publish them for others to use.