@type t() :: %Envoy.Extensions.Filters.Http.JwtAuthn.V3.JwksAsyncFetch{
__unknown_fields__: [
{field_number :: integer(), Protobuf.Wire.Types.wire_type(),
value :: term()}
],
failed_refetch_duration: Google.Protobuf.Duration.t() | nil,
fast_listener: boolean()
}