voltctl supports multiple stack configurations in a single configuration file. The format of the v3 configuration file that supports multiple stacks is of the format
apiVersion: v3 currentStack: <stack-name-reference> stacks: - name: <stack-name-reference> <values>
As part of the support for multiple stacks a new command line option,
--stack was added. This option can be used to specify which stack configuration should be used for each command invocation.
stack was added to support the listing, deletion, and addition of stacks to the configuration file. In addtion the
stack use command was added to persistently set the current stack name back to the configuration. (see
voltctl stack --help for more information)