Quick Cluster Overview allows you to grab the vital data of your cluster in one glimpse. By timely visualization it allows you to view the development of values throughout the cluster as they happen. Hereby the architecture ensure that the load onto the cluster and the monitoring system is minimal. Thereby providing a usefull tool to see how heat and other values spread throughout the cluster while you perform work.
It is not a replacement for cluster monitoring systems like Ganglia or Lemon, which excell at monitoring the state of each node over time, but it uses the data from this systems to give you the current data from all nodes in one plot.