I'm reading micro-stacks, what I don't understand is, how do I create a

StackReference

by

<organization>/<project>/<stack>

If I use Self-managed backend (gs) , what is my organization?

Currently the naming for stacks in the self-managed backends is different - and will just use the stack name. This is something we'd like to improve for the self-managed backends as noted in https://github.com/pulumi/pulumi/issues/2522 generally. Also see https://github.com/pulumi/pulumi/issues/2522#issuecomment-593088942 for a pattern that can be used here today.