Her reasons for leaving were 'obvious'. = It's 'obvious' why she left.
You are stating 'the obvious'. Tell me something I don't already know.
Her doctor immediately noticed the 'obvious' signs of the disease.
(..) I want someone on the airfield and stick with her for a couple of days. -Rafterman, you take it. -Aye, aye, sir. And get some good low-angle stuff. Don't make it too obvious, but I wanna see fur and early-morning dew. -Yes, sir. -""Diplomats in dungarees. Marine engineers lend a helping hand (..)1987 Full Metal Jacket