[Observium] Alerts

Hi List. At present i have installed the latest versión of Observium and i am trying to configure an alert for a temperature sensor of a cisco catalyst and i do not how.

On the other hand, i don´t have any alert in the home screen (right upper corner Alerts: 0), it is normal? i have rebooted some devices and disconnect some ports and the alerts still 0, but the emails with alerts are send correctly.

Thanks so much. Cristian,