(renamed topic to make less generic)
I like the idea...
there is an official 'solved' plugin for discourse
the advantage of this over tags, is users can mark the post which solves the topic, and then the original post has a link to the 'solution post'
(it can be configured to allow 'solved' in one certain categories, which may be useful.. say in the helpdesk area?)
@johannes what do think? (it needs server access to install, so up to you )
just one note...
this will be as successful as community members make it as they need to mark solutions.
also, its only really going to work for topics that are one issue...so topic which fire different questions wont work so well.
(and perhaps obvious, but we moderate with a 'light touch' here, so won't be routinely marking things solved)