Using trend analysis and forecasting, the Capacity Service helps users understand how their cluster is performing within its current environment and workload, and gain a better sense of how time affects those trends, both past and future.
Several types of metrics are collected, including Cassandra specific and platform specific (for example, disk metrics, network metrics), at both the node and column-family level (where applicable). These metrics are stored in Cassandra, on the cluster being managed by default. That data can be stored on a separate, dedicated cluster as well.
The Trend Analysis component of the Capacity Service allows users to view historical metrics for any node or column family, as well as aggregates across the entire cluster.
Using the Forecast feature, users are able to see a predicted trend for any metric-based on historical data that has been collected.