# POST /api/v1/dashboards/{dashboard_id}/widgets/{widget_id}/alert

> Create an alert on a metric widget

- **Tag:** dashboards
- **Operation ID:** `create_widget_alert`

## Description

Create a threshold alert rule bound to a metric widget. The rule is evaluated against the widget's **stored snapshot** — it never re-executes the widget's source tool, so the alert is exactly as fresh as the dashboard itself. Returns 400 if the widget is not a metric widget or if `value_path` does not resolve to a number in the current snapshot.

## Authentication

Bearer token in `Authorization` header.
Required header: `x-business-id: <business uuid>`.

## Parameters

- `dashboard_id` (path, string, required)
- `widget_id` (path, string, required)

## Request body

Schema: `CreateWidgetAlertRequest`

- `name` (string)
- `threshold_value` (integer · required)
- `threshold_direction` (string · required) (one of: above, below)
- `value_path` (string)
- `channels` (array · string)
- `check_frequency` (string) (one of: hourly, daily, weekly)
- `cooldown_hours` (integer)
- `description` (string)
- `slack_channel` (string)

## Responses

### 201 — Successful Response

Schema: `SuccessEnvelope_WidgetAlertResponse_`

- `success` (boolean)
- `message` (string)
- `code` (string)
- `data` (WidgetAlertResponse)

### 400 — Bad Request - Invalid input

Schema: `ErrorResponse`

- `error` (string · required) — Error category: `validation_error`, `unauthorized`, `forbidden`, `not_found`, `conflict`, `rate_limited`, `server_error`, or `service_unavailable`.
- `message` (string · required) — Human-readable explanation, safe to show to end users.
- `code` (string · required) — Stable machine-readable code in `CATEGORY_NNN` form (e.g. `NOT_FOUND_006`, `AUTH_010`, `GEN_002`).
- `request_id` (string) — Correlation id for support requests. Echoes the `x-request-id` request header when one was supplied.
- `errors` (object) — Field-level validation messages keyed by field name. Present on 400/422 validation failures only.

### 401 — Unauthorized - Missing/invalid token or no access to this business

Schema: `ErrorResponse`

- `error` (string · required) — Error category: `validation_error`, `unauthorized`, `forbidden`, `not_found`, `conflict`, `rate_limited`, `server_error`, or `service_unavailable`.
- `message` (string · required) — Human-readable explanation, safe to show to end users.
- `code` (string · required) — Stable machine-readable code in `CATEGORY_NNN` form (e.g. `NOT_FOUND_006`, `AUTH_010`, `GEN_002`).
- `request_id` (string) — Correlation id for support requests. Echoes the `x-request-id` request header when one was supplied.
- `errors` (object) — Field-level validation messages keyed by field name. Present on 400/422 validation failures only.

### 403 — Forbidden - Insufficient permissions

Schema: `ErrorResponse`

- `error` (string · required) — Error category: `validation_error`, `unauthorized`, `forbidden`, `not_found`, `conflict`, `rate_limited`, `server_error`, or `service_unavailable`.
- `message` (string · required) — Human-readable explanation, safe to show to end users.
- `code` (string · required) — Stable machine-readable code in `CATEGORY_NNN` form (e.g. `NOT_FOUND_006`, `AUTH_010`, `GEN_002`).
- `request_id` (string) — Correlation id for support requests. Echoes the `x-request-id` request header when one was supplied.
- `errors` (object) — Field-level validation messages keyed by field name. Present on 400/422 validation failures only.

### 404 — Not Found - Resource does not exist

Schema: `ErrorResponse`

- `error` (string · required) — Error category: `validation_error`, `unauthorized`, `forbidden`, `not_found`, `conflict`, `rate_limited`, `server_error`, or `service_unavailable`.
- `message` (string · required) — Human-readable explanation, safe to show to end users.
- `code` (string · required) — Stable machine-readable code in `CATEGORY_NNN` form (e.g. `NOT_FOUND_006`, `AUTH_010`, `GEN_002`).
- `request_id` (string) — Correlation id for support requests. Echoes the `x-request-id` request header when one was supplied.
- `errors` (object) — Field-level validation messages keyed by field name. Present on 400/422 validation failures only.

### 422 — Validation Error

Schema: `ErrorResponse`

- `error` (string · required) — Error category: `validation_error`, `unauthorized`, `forbidden`, `not_found`, `conflict`, `rate_limited`, `server_error`, or `service_unavailable`.
- `message` (string · required) — Human-readable explanation, safe to show to end users.
- `code` (string · required) — Stable machine-readable code in `CATEGORY_NNN` form (e.g. `NOT_FOUND_006`, `AUTH_010`, `GEN_002`).
- `request_id` (string) — Correlation id for support requests. Echoes the `x-request-id` request header when one was supplied.
- `errors` (object) — Field-level validation messages keyed by field name. Present on 400/422 validation failures only.

## Code samples

### cURL

```bash
curl -X POST 'https://api.ondayzero.com/api/v1/dashboards/{dashboard_id}/widgets/{widget_id}/alert' \
  -H 'Authorization: Bearer dz_your_token' \
  -H 'x-business-id: YOUR_BUSINESS_ID' \
  -H 'Content-Type: application/json' \
  -d '{
  "threshold_value": 0,
  "threshold_direction": "above"
}'
```

### JavaScript

```javascript
const response = await fetch('https://api.ondayzero.com/api/v1/dashboards/{dashboard_id}/widgets/{widget_id}/alert', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer dz_your_token',
    'x-business-id': 'YOUR_BUSINESS_ID',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
  "threshold_value": 0,
  "threshold_direction": "above"
}),
});
const data = await response.json();
```

### Python

```python
import httpx

headers = {
    "Authorization": "Bearer dz_your_token",
    "x-business-id": "YOUR_BUSINESS_ID",
}

payload = {'threshold_value': 0, 'threshold_direction': 'above'}

response = httpx.post("https://api.ondayzero.com/api/v1/dashboards/{dashboard_id}/widgets/{widget_id}/alert", headers=headers, json=payload)
data = response.json()
```

## See also

- HTML version: https://www.ondayzero.com/docs/reference/dashboards/create-widget-alert
- OpenAPI slice: https://www.ondayzero.com/docs/reference/dashboards/create-widget-alert/openapi.json
- Other endpoints in **dashboards**: https://www.ondayzero.com/docs/reference/dashboards (markdown bundle: https://www.ondayzero.com/docs/reference/dashboards.md, OpenAPI: https://www.ondayzero.com/docs/reference/dashboards/openapi.json)
- Endpoint catalog: https://www.ondayzero.com/docs/reference/index.md