frutiger metro is the successor (fortunate or unfortunate) to the well-renowned frutiger aero. unlike frutiger aero, however, it uses massive splashes/jumbles of vector shapes and stencils; which also goes into two of it's other names: vector metro and vector vomit. this era of design came packaged with Windows 8, which was an operating system (developed by Microsoft) originally meant for tablets; atleast before the time Windows 8.1 was released, where it was tablet and pc-friendly. Windows 8, as opposed to Vista or 7, opted for larger and more organised 'live tiles' rather than icons; on tablets, this would make them a lot easier to press.
there are a lot of similarities between frutiger aero and frutiger metro, those being the glossy elements, maximalism, and skeuomorphism; but also a lot of differences. the most prominent of these differences are the burst of shapes and stencils, (sometimes) the addition of real-like objects, and the flatter/simplified tone/texture. sometimes, both frutiger aero and metro were combined, giving the frutiger aero part a bit of a flat style - which, in some cases, made it look really good;
this image is from one of the Windows 8 wallpapers, you can see how it merges the vector trees at the bottom with the realism/frutiger aero look of the mountains further back.