Recently this notification has started showing up quite repeatedly on Stack Exchange sites:
The problem is that it's not necessary, and even if it is, it should not be showing up repeatedly.
In just the last few months, these sorts of notifications have really risen on the Internet (think of YouTube's new notifications in the lower-left hand corner), and they are very stressful to deal with for three reasons:
They add clutter to the site's UI.
They are typically not necessary or relevant for the user.
Users should not have to dismiss the same notification over and over again.
All of these issues apply here. Can we please get rid of this notification, and can we please keep the site's UI clean? A clean, non-spammy UI is one of the reasons Stack Exchange got to be as popular as it is.
The one answer suggests making the dismissal of this notification sitewide, and I suggest getting rid of it altogether. In fact, I suggest never having notifications for things like this in general. Clean notifications for community activity and such are great, but messy notifications for UI features, news updates, and so on are basically just clutter and an irritant.
So there is some similarity between the two suggestions, but there's a little bit of difference as well.