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Some old questions are usually "edited" by Community profiles on the network sites, in order to get more attention if they meet certain criteria.
Is there a way to know that an old question has already been bumped by Community, or does the warning on the yellow board disappear after some time?
Yeah, the message only shows up for a day or so (currently 1 day on Stack Overflow, 3 everywhere else). But, a history record is created when the post is bumped, so you can use the Stack Exchange Data Explorer to find out when questions were bumped in the past:
select top 500 -- only most recent 500 for this example; we're not that bored
PostId [Post Link], CreationDate "Date Bumped"
from PostHistory
where PostHistoryTypeId=50
order by CreationDate desc
The community bump notice disappears after any activity or ages away after three days of inactivity (or one on Stack Overflow). You can see if a particular post has been bumped by looking at that post's timeline or revision list. You can see a post's timeline using the URL:
http://{site}/posts/{post-id}/timeline
or, revision list:
http://{site}/posts/{post-id}/revisions
This question, for example, was recently bumped. You can see that it has been bumped twice in the last month...
