[aspett]

> Deprecated

> This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped.

Ok..

[Ajedi32]

Keep reading:

> Though the report-to directive is intended to replace the deprecated report-uri directive, report-to isn’t supported in most browsers yet.

So it's deprecated, but until it's replaced by report-to (which works in a very similar way) report-uri is still the proper way to make this feature work.

I would have linked to report-to instead, but MDN doesn't have good documentation on that yet.