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An alarm activates when a metric passes a certain threshold. If you imagine a dashboard for your metrics, alarms are like red lights that light up when conditions change, for example, when there is a problem. 

If you would like the platform to notify you when an alarm activates, create an Alert for it in Control view. Alerts are a group of one or more alarms. They are like a worker monitoring a group of alarms; when all the lights for the group are lit up, the alert is activated. Alerts can also trigger action plans to perform automated actions when their alarms activate. After you create an alert, create an action plan in Control view with the alert as a trigger.

In Infrastructure view you can create alarms for custom metrics on infrastructure elements. You can also create alarms for built-in metrics for deployed VMs that you can access through the infrastructure path of their providers.

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To create custom metrics for infrastructure elements, including datacenters, racks, and physical machines, use the API. To automatically fetch metrics for all VMs, after you configure and enable monitoring for the platform, in Configuration view, set the Enable virtual machine monitoring by default property to true.

Create an alarm

To create an alarm: