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What is a calm approach to grouping on request

consider the following http request:

GET /defects?group-by=priority

I would like the returned collection (feed) of defects to be grouped by their priority. that is, the returned feed consists of defects (resources) and group information.

I thought of something that would return the names of the groups and count before returning the collection, for example:

<content>
<Group val="High" count="567"/>
<Group val="Medium" count="437"/> 
<Group val="Low" count="19"/> 
<Defect ,,,,>
<Defect ,,,,>
<Defect ,,,,>
</content>

The problem with this view is that the requested resource (URL) is a defect, so the client expects a collection of defects, not a Group element.

I think that one of the solutions to this problem would be to define a separate resource of groups for defects, namely:

 defects/groups?group1=priority

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a group of defects != a defect

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