# AlertTriggerPolicy

Canonical page: https://www.adaptabletools.com/docs/reference/alerttriggerpolicy

Firing policy of a live (observable / clock-reading) alert rule.

```ts title="TypeScript"
export interface AlertTriggerPolicy 
```

## Properties

| Property | Type | Description |
| --- | --- | --- |
| [FireOn](https://www.adaptabletools.com/docs/reference/alerttriggerpolicy.md#fireon) | `'BecomeTrue'` | `'BecomeTrue'` (the only policy, and the default): fire when the rule<br/>turns from false to true; stay silent while it remains true; a rule that<br/>is already true when the Alert is created does not fire until it turns<br/>false and true again. |

## Property Details

### FireOn

`'BecomeTrue'` (the only policy, and the default): fire when the rule
turns from false to true; stay silent while it remains true; a rule that
is already true when the Alert is created does not fire until it turns
false and true again.

```ts title="TypeScript"
FireOn?: 'BecomeTrue';
```

###### Property Value

`'BecomeTrue'`