You can identify triggered alarms in the vSphere Client Inventory panel, the Status bar, and the Alarms tab.

Triggered Alarm Indicators in the vSphere Client

vSphere Client Location

Triggered Alarm Indicator

Inventory panel

An icon on the object where the alarm was triggered.

Status bar, Triggered Alarms panel

A list of alarms triggered on all inventory objects. Double-click an alarm to select the object in the inventory on which the alarm was triggered.

Alarms tab

A list of alarms triggered on the selected inventory object.