graphite: add warning message
graphite: add warning message

iksaif/biggraphite,criteo/biggraphite,criteo/biggraphite,iksaif/biggraphite,criteo/biggraphite,iksaif/biggraphite,Thib17/biggraphite,Thib17/biggraphite,Thib17/biggraphite,Thib17/biggraphite,iksaif/biggraphite,criteo/biggraphite