with Octo.exe for octopus 2.xx is is possible to use a REGEX with the specific machines deployment step.
Such that I could say… Deploy to machines for project X that have a even number (2,4,6,8,0) or odd machines. Where i could use a modulus to control what is deployed to.
to do this in 1.x I created a sub environment in which the odd machines were in env-a and env-b contained the even machines.