public ConnectToClusterViewModel(IServerInfo serverInfo, HttpClient client, IEventAggregator aggregator, IClusterConnectionTracker tracker)
 {
     _serverInfo = serverInfo;
     _client     = client;
     _aggregator = aggregator;
     _tracker    = tracker;
 }
 public ClusterConnectionTrackerController(IClusterConnectionTracker tracker) => _tracker = tracker;