Operator view on optical transport network automation in a multi-vendor context [Invited]. - Esther Le Rouzic; Olivier Renais; Julien Meuric; Thierry Marcot; Christophe Betoule; Gilles Thouénon; Ahmed Triki; Maxime Laye; Nicolas Pelloquin; Yannick Lagadec; Emmanuelle Delfour; Matthias Ermel; et al. (JOCN, 2022)