How to preserve a custom directive in apollo router superschema.

[dmitrypotenko]

Hello Apollo router team,
We are using apollo router v2.0.0 in combination with hive as a schema registry. We want to preserve a custom directive in final supergraph so that it is visible in the result of an introspection query against router. I see that custom directive is in hive supergraph after composition, but it is not visible in the router after router fetches supergraph from hive. How is it possible to keep this directive in router?

That is how our directive looks like:

"""
This directive should be used in combination with the @deprecated directive.
It indicates that a field will be sunset on a specific date, meaning it can be removed any time after that date.
"""
directive @sunset(
    """
    A date when the field will be sunset.
    """
    date: String!
) on FIELD_DEFINITION | ARGUMENT_DEFINITION | INPUT_FIELD_DEFINITION | ENUM_VALUE

We have also included it in schema with @link and @composeDirective

 @link(
        url: "https://github.com/sunset/someurl/v1.0"
        import: ["@sunset"]
    )
    @composeDirective(name: "@sunset")