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There is an Alarms tab in the Infrastructure view for data centers, racks, physical machines, and VM entities on the Infrastructure path. And there is another Alarms tab in the Virtual datacenters view, for virtual resource entities, including VDCs, VApps, VMs, and scaling groups.
Users can detect metric conditions changes in metrics using Alarms and Alerts. 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. Alerts are like a worker monitoring a group of alarms; when all the lights for the group are lit up, the alert is activated.
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