# Alerts

> Provides the information about alert instances generated by triggers, including labels, timestamps, status, and other details.

# Alerts

:::tip NOTE

This feature is only available in the GreptimeDB Enterprise database.

:::

The `ALERTS` table provides the information about all alert instances generated
by triggers.

```sql
DESC TABLE INFORMATION_SCHEMA.ALERTS;
```

```sql
+--------------+---------------------+------+------+---------+---------------+
| Column       | Type                | Key  | Null | Default | Semantic Type |
+--------------+---------------------+------+------+---------+---------------+
| trigger_id   | UInt64              |      | NO   |         | FIELD         |
| trigger_name | String              |      | NO   |         | FIELD         |
| labels       | Json                |      | NO   |         | FIELD         |
| annotations  | Json                |      | YES  |         | FIELD         |
| status       | String              |      | NO   |         | FIELD         |
| active_at    | TimestampNanosecond |      | NO   |         | FIELD         |
| fired_at     | TimestampNanosecond |      | YES  |         | FIELD         |
| resolved_at  | TimestampNanosecond |      | YES  |         | FIELD         |
| last_sent_at | TimestampNanosecond |      | YES  |         | FIELD         |
+--------------+---------------------+------+------+---------+---------------+
```

The columns in table:
* `trigger_id`: the id of the trigger that generated the alert instance.
* `trigger_name`: the name of the trigger that generated the alert instance.
* `labels`: the key-value pairs associated with the alert instance. And the label
    set uniquely identifies an alert instance.
* `annotations`: the key-value pairs associated with the alert instance.
* `status`: the current status of the alert instance.
* `active_at`: the timestamp when the alert instance became active.
* `fired_at`: the timestamp when the alert instance first entered the `Firing`
    state.
* `resolved_at`: the timestamp when the alert instance was resolved.
* `last_sent_at`: the timestamp when the last notification for the alert instance
    was sent.