> ## Documentation Index
> Fetch the complete documentation index at: https://docs.agrihub360.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Custom Triggers
> Your own thresholds on readings, frost, wind, rain or a silent sensor.
## What It Tells You
A **custom trigger** is a threshold you set yourself on a field. It can be soil moisture below a value, soil temperature above one, a forecast frost, wind or rain over a limit, or a sensor that has stopped reporting. The built-in windows answer the common questions. A trigger answers yours, such as the moisture at which a clay field needs a look, or the wind above which you want warning before the contractor arrives. When it fires you get an alert that names the reading that crossed the line.
## How It Works
Set the field, the reading or forecast value, the comparison and the threshold. A trigger that fires raises an alert. If you have a webhook, it also sends a `trigger.fired` event. A silent sensor is the same `device.offline` state the app shows as stale.
