Right now, I have a file called validation.yml with the validation of all the bundle\'s entities in one file.
validation.yml
Blogger\\BlogBundle\\Ent
Since Symfony 3.3 all files present in YourBundle/Resources/config/validation/* are registered.
YourBundle/Resources/config/validation/*
Since Symfony 3.4 all files present in %kernel.project_dir%/config/validator/* are also registered.
%kernel.project_dir%/config/validator/*