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.
(..) have a chance to become really good at sports I wasn't bad What about the obvious remedy... reversing things, maybe working at a newspaper I don't write Ha ha! But that didn't stop me (..)1987 Broadcast News