A CL containing proposed changes to the
      [config.txt](https://go.googlesource.com/telemetry/+/master/internal/chartconfig/config.txt)
      chart configuration.
      See the [chartconfig](https://pkg.go.dev/golang.org/x/telemetry/internal/chartconfig)
      package for an explanation of the chart config format.
      For an example change, see [CL 564619](https://go.dev/cl/564619).
  validations:

	switch t {
	case scanner.EOF:
		return "EOF"
	case scanner.Ident:
		return "identifier"
	case scanner.Int:
		return "integer constant"
	case scanner.Float:
		return "float constant"
	case scanner.Char:
		return "rune constant"
	case scanner.String:
		return "string constant"
	case scanner.RawString:
		return "raw string constant"
	case scanner.Comment:
		return "comment"
	default: