Etiquette for questions whose answer is stale [duplicate]

Question

Possible Duplicate:
How to deal with obsolete answers?

As StackOverflow has gotten older and the recommended way of doing things has evolved over time. A feature was proposed earlier, but it sounds complicated. Without a feature to support marking something as stale, what is the etiquette for handling such an answer? Leaving a comment on the answer that it's no longer up to date? Providing an alternate answer that calls out that something has changed?

Answer 1

I think the better Idea would be to have a tag associated by the moderator or subject matter expert to that question which calls something like obsolete answer or stale-answer or something like that. We already have these tags like status-by-design, status-completed, status-declined, that are setup by moderators only/ May be the user who has maximum reps about that topic can set that flag.