You can view data about your cluster to monitor cluster performance. For example, you can monitor the performance of volumes by viewing statistics that show throughput and latency.
What objects, instances, and counters are
You can view performance data for specific objects in your cluster. Objects are comprised of instances and counters. Counters provide data about the instances of an object.
Viewing performance data for a time period
You can monitor cluster performance by collecting and viewing data for a specific time period (a sample). You can view data for several objects and instances at a time.