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The reports are an Administrator tool. Only users with Administrator permissions can access them.

There are 2 reports: 

• Filtered Collection: this report is counting the numbers of item per community/collection. A large variety of filter can be used (ex: Discoverable Items - Not Private ; Item has No Original Bitstreams, Has unusually large PDF, Has document bitstream without TEXT item, Item Image Bitstreams are Supported, Item has Restricted Original Bitstream etc.). Results table is displayed in the UI.
  The filtered collection reports is documented in DSpace Filtered Collections report endpoint. 
• Metadata Query : this report build a report based on different main criterias (Collection Selector, Metadata Field Queries, Limit/Paginate Queries, Filters, Additional data to return). Item Results are displayed in the UI
  The metadata query report is documented in DSpace Metadata query (aka Filtered Items) report endpoint. 

How to enable

The reports are desabled by default. The reports can be enable or disable in contentreport.cfg

Once enable, the reports are available in the admin menu as shown below:

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