Something that was done at a previous company I was at was to dedicate a rarely used emoji reaction (IIRC, :eject:) to mean "this information should be captured

Something that was done at a previous company I was at was to dedicate a rarely used emoji reaction (IIRC, :eject:) to mean "this information should be captured somewhere other than slack. Messages that got that response would automatically be sent to a special channel, where they could be marked as complete. It worked okay.