Function updater_handle_one_update

pub(crate) async fn updater_handle_one_update(
    statsd: &Client,
    conf: &Conf,
    probe_interval: Duration,
    upwrap: UpWrap,
    service_statuses: &mut HashMap<String, ServiceStatus>,
) -> Result<()>

Receives an incoming datapoint from a probe or a request to generate the dashboard page Triggers DNS failover / RR change if needed.