I'm afraid this is not possible. However, you can configure a latency for notification triggers. Using the latency setting, notification will only be triggered when the causing condition still exists after x seconds.
Take a look at Custom Sensor SensorCount.
This sensor counts the number of sensors with a specific state (up, down, warning,...). In the channels tab you can set up this sensor to go into a error state if for example more than 10 sensors are down.
Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.