☂ Migrate remaining configuration files to YAML format

[bneradt]

Summary

This umbrella issue tracks the migration of all remaining .config configuration files to YAML format. ATS has been progressively moving to YAML for configuration files to provide a more structured, readable, and maintainable configuration experience.

Background

Several configuration files have already been converted to YAML:

• ✅ ip_allow.yaml
• ✅ jsonrpc.yaml
• ✅ logging.yaml
• ✅ records.yaml
• ✅ sni.yaml
• ✅ strategies.yaml

Remaining Configuration Files

The following files still use the legacy .config format and should be migrated to YAML:

• cache.config → cache.yaml (see When rewriting cache.config in YAML, make it not additive. #7701)
• hosting.config → hosting.yaml
• parent.config → parent.yaml
• plugin.config → plugin.yaml
• remap.config → remap.yaml @serrislew (see ☂ Migration to remap.yaml #5590)
• socks.config → socks.yaml
• splitdns.config → splitdns.yaml
• ssl_multicert.config → ssl_multicert.yaml @bneradt (see ssl_multicert.config -> ssl_multicert.yaml #12755)
• storage.config → storage.yaml (see Change volume.config and storage.config to storage.yaml #10766)
• volume.config → volume.yaml (see Change volume.config and storage.config to storage.yaml #10766)

Related Issues

• ☂ Migration to remap.yaml #5590 - ☂ Migration to remap.yaml
• When rewriting cache.config in YAML, make it not additive. #7701 - When rewriting cache.config in YAML, make it not additive
• Change volume.config and storage.config to storage.yaml #10766 - Change volume.config to volume.yaml
• ☂ Remove various _filename records.config variables. #5363 - ☂ Remove various _filename records.config variables

Migration Guidelines

For each configuration file migration:

1. Design a YAML schema with a consistent top-level namespace (per ☂ Proper "top level" name space for all yaml #5245)
2. Implement the YAML parser alongside the existing parser
3. Provide a migration script or tool for users
4. Update documentation
5. Deprecate the old format with appropriate warnings
6. Remove the old format in a future major release

Note: these conversions should be done on the 11-Dev branch since these conversions will not be done in the 10.x release series.

[masaori335]

parent.config → parent.yaml

IIRC, the parent.config is already deprecated in favor of strategies.yaml. So we're going to remove parent.config by ATS v11.