config-generator is a tool that takes a meta config file (e.g. ../../config/prod/prow/config_knative.yaml) and templates as input, and generates configuration files for Prow and testgrid.
As Knative evolves and more and more Prow jobs are required, this tool has become clumsy and hard to maintain. There have been some initial discussions to replace it with a more generic solution, but no clear outcome yet. If you have any ideas on it, please join the discussion in Knative Productivity Slack channel.