MON-289 add dropped connections monitor Approved-by: Quentin Manfroi <quentin.manfroi@yahoo.fr> Approved-by: Alexandre Gaillet <alexandre.gaillet@fr.clara.net> Approved-by: Jérôme Respaut <shr3ps@gmail.com> Approved-by: Jean-Philippe LAINÉ <jean-philippe.laine@fr.clara.net>