When I export a dashboard as a link, I can enter the number of days for that the link is going to be valid. It would be great if I could have the option to be notified shortly before the link expires. I would then be able to send out a new link before the recipients of the link can't access that dashboard anymore.
Back in the days, the lifespan limit for link exports was 30 days, we increased this to 180 days. Notifying about the expiration of a link export is not on our roadmap for now.