T347435 and T347531 present people with feedback when they attempt to add a source that exists on a given project's Special:BlockedExternalDomains page within the 2010 wikitext editor and visual editor (mobile/desktop) respectively.
This task involves the work of expanding the URLs/sources people would receive reliability feedback about. Specifically, if we consider T347435 and T347531 to be about blocking people from publishing a defined set of domains, this ticket asks us to consider how we might offer people feedback (read: warn/inform) about sources they are not blocked from published and experienced volunteers are likely to question how reliable they are.
Data
References people cite when adding new content
