private static async Task PropigateStatisticsToCluster(IGrainFactory grainFactory)
{
// force the latched statistics to propigate throughout the cluster.
IManagementGrain mgmtGrain =
grainFactory.GetGrain <IManagementGrain>(0);
var hosts = await mgmtGrain.GetHosts(true);
var keys = hosts.Select(kvp => kvp.Key).ToArray();
await mgmtGrain.ForceRuntimeStatisticsCollection(keys);
}