Via Configuration File Customizable Key Prefix

[michigg]

Currently the .json configuration file do not provide options to configure a custom label prefix for the auto discovery.
I would prefer to configure the auto discovery via the json file instead of saving the command with all its options.

[agp8x]

The .json configs (actually all explicit configs) do not perform autodiscovery. The configs provides a list of docker-composed service directories, and we invoke the given command there (started with start.py/start.sh).
Using discovery.py, you can set an environment variable PREFIX, or pass the prefix as an argument.
Is either option suitable for your use case?