The monitoring system displays VM metrics and the user can configure alerts to trigger actions if certain conditions are met within virtual appliances. If your virtual datacenter supports monitoring, but you don't see any metrics for your virtual appliance, you may need to edit your VMs and configure monitoring on the VM monitoring tab. See VM monitoring and metrics
Then you can configure the display of metrics at the virtual appliance level.
To configure the refresh interval
Choose the metrics you wish to display and filter by metric statistics.
When you are fetching metrics, you can configure alarms on these metrics. See Manage cloud alarms