I am receiving the following notification:
Have you considered accepting an answer or starting a bounty for this question? Rails audit system
but there is no "start bounty" link! I can't see how to start a bounty on my question.
Are you sure you look in the right place? Should be available from the question page:
Following comments, the problem is that you already have active bounty on other question.
The FAQ mentions this as part of the "Which questions are eligible?" section but it might be good feature request to not show the notification in such case, or show the "start a bounty" link anyway and clicking it will produce message saying something like "You already have active bounty on (question here) please award it first".