Total data size

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Is your feature request related to a problem? Please describe.

The total data size of the cloud is missing. Cloud admins can't find this information and they need it, in our setup at least.

Describe the solution you'd like

Show the total data size (including / excluding the trashbins)

Describe alternatives you've considered

We tried custom solutions (scripts), but it's very complicated.
In example, who to send the report when clouds have lots of admins.

I tried this app (https://apps.nextcloud.com/apps/user_usage_report), but it's not working, no mail are sent (the mails are working good) and when unchecking all options I have an error.

If you know another one that does that, I'll be happy to test it.

Additional context

I know it's possible to see the data used on a disk (saw several posts giving this as a solution), but we share several clouds on the same disk, so these infos are not useful in our case.

Thank you

No files or tests are named in the issue; start by reviewing the serverinfo app's dashboard entry point and how it obtains storage usage. Done means displaying total cloud data size for administrators with an explicit choice or distinction for trashbins, supported by appropriate tests.