Understanding the Clusters Page
Describes the features in the Clusters page, which lists your clusters, the services that use them, the last time they were updated, and whether you enabled the daily cluster report.
By default, the Clusters page displays your clusters by the date that they were last updated. You can sort your clusters in ascending or descending order from the Cluster Name column.
The Email Report column indicates whether you are subscribed to the Cluster Reports email for that cluster, which is enabled by selecting the Enable Cluster Report Emails option in the Actions menu.