Rattling noise 2015 Mazda6 GT

My 2015 Mazda6 GT just began making this odd metallic rattling/squealing noise. I cant quite pinpoint where its coming from exactly, but it sounds like its up near the valve cover on the drivers side. Its noticeable inside the car at idle as well. I know the 2.5 skyactiv is a noisy engine but this sound doesnt sound normal. Any thoughts on what I could check?