The fabric8.yml file is an optional YAML file that the Microservices Platform tools use to store project configuration inside the source code of a project. 
Its a place you can store things like
Usually the file is lazily created when there is some custom configuration for a project to be stored.
fabric8.yml fileThere are a few ways you can edit the contents:
project settings button in the consolefabric8.yml file directly using a text editor in source control