pub trait DnsServerWatcherProxyInterface: Send + Sync {
type WatchServersResponseFut: Future<Output = Result<Vec<DnsServerList>, Error>> + Send;
type CheckPresenceResponseFut: Future<Output = Result<(), Error>> + Send;
// Required methods
fn watch_servers(&self) -> Self::WatchServersResponseFut;
fn check_presence(&self) -> Self::CheckPresenceResponseFut;
}