The phrase "obvious irony" means when something happens or is said that is the opposite of what is expected or intended, and it is very easy to notice. Full definition
They have also delivered the opposite message but with obvious irony. (haberarts.com)
The most obvious irony of this sport is that the best eaters are often the scrawniest. (discovermagazine.com)
The Guerrilla Girls are not represented by any gallery and have always kicked out against institutions, so there is obvious irony in museums such as the Getty and Tate having their artworks in their permanent collections. (theguardian.com)