Function spawn_system_status_server 

pub async fn spawn_system_status_server(
    host: &str,
    port: u16,
    cancel_token: CancellationToken,
    drt: Arc<DistributedRuntime>,
    discovery_metadata: Option<Arc<RwLock<DiscoveryMetadata>>>,
) -> Result<(SocketAddr, JoinHandle<()>)>

Start system status server with metrics support