--- title: Create metric collection description: Datadog, the leading service for cloud-scale monitoring. breadcrumbs: Docs > API Reference > Experiments --- > For the complete documentation index, see [llms.txt](https://docs.datadoghq.com/llms.txt). {% callout %} # Important note for users on the following Datadog sites: app.ddog-gov.com, us2.ddog-gov.com {% alert level="danger" %} This product is not supported for your selected [Datadog site](https://docs.datadoghq.com/getting_started/site.md). ({% placeholder "user-datadog-site-name" /%}). {% /alert %} {% /callout %} # Create metric collection{% #create-metric-collection %} {% tab title="v2" %} | Datadog site | API endpoint | | ----------------- | ------------------------------------------------------------------------ | | ap1.datadoghq.com | POST https://api.ap1.datadoghq.com/api/v2/experiments/metric-collections | | ap2.datadoghq.com | POST https://api.ap2.datadoghq.com/api/v2/experiments/metric-collections | | app.datadoghq.eu | POST https://api.datadoghq.eu/api/v2/experiments/metric-collections | | app.ddog-gov.com | POST https://api.ddog-gov.com/api/v2/experiments/metric-collections | | us2.ddog-gov.com | POST https://api.us2.ddog-gov.com/api/v2/experiments/metric-collections | | uk1.datadoghq.com | POST https://api.uk1.datadoghq.com/api/v2/experiments/metric-collections | | app.datadoghq.com | POST https://api.datadoghq.com/api/v2/experiments/metric-collections | | us3.datadoghq.com | POST https://api.us3.datadoghq.com/api/v2/experiments/metric-collections | | us5.datadoghq.com | POST https://api.us5.datadoghq.com/api/v2/experiments/metric-collections | ### Overview Create metric collection. This endpoint requires the `product_analytics_metrics_write` permission. OAuth apps require the `product_analytics_metrics_write` authorization [scope](https://docs.datadoghq.com/api/latest/scopes.md#experiments) to access this endpoint. ### Request #### Body Data (required) {% tab title="Model" %} | Parent field | Field | Type | Description | | ------------ | ---------------------------- | -------- | --------------------------------------------------------------------------- | | | data [*required*] | object | Metric collection resource to create. | | data | attributes [*required*] | object | Name, description, and metric selection for the new collection. | | attributes | description | string | Description of the metric collection. | | attributes | is_guardrail | boolean | Whether the collection is designated as a guardrail collection. | | attributes | metrics | [object] | Metrics to include in the collection. | | metrics | metric_id [*required*] | uuid | Identifier of the metric to include in the collection. | | attributes | name [*required*] | string | Display name of the metric collection. | | data | id | string | Optional JSON:API resource identifier field. | | data | type [*required*] | enum | Metric collections resource type. Allowed enum values: `metric-collections` | {% /tab %} {% tab title="Example" %} ```json { "data": { "type": "metric-collections", "attributes": { "name": "ex-14bb9543f523edde" } } } ``` {% /tab %} ### Response {% tab title="201" %} Created {% tab title="Model" %} Response containing the metric collection. | Parent field | Field | Type | Description | | ------------ | ---------------------- | --------- | --------------------------------------------------------------------------- | | | data [*required*] | object | JSON:API resource containing the metric collection identity and fields. | | data | attributes | object | Details of the metric collection. | | attributes | created_at | date-time | Time when this resource was created. | | attributes | description | string | Text that explains the metric collection. | | attributes | is_guardrail | boolean | Whether the collection is used for guardrail metrics. | | attributes | metric_count | int64 | Number of metrics in this collection. | | attributes | metrics | [object] | Metrics included in this collection. | | metrics | metric_id | string | ID of the metric represented by this entry. | | metrics | metric_name | string | Display name of the metric represented by this entry. | | attributes | name | string | Display name of the metric collection. | | attributes | updated_at | date-time | Time when this resource was last updated. | | data | id [*required*] | uuid | ID of the metric collection. | | data | type [*required*] | enum | Metric collections resource type. Allowed enum values: `metric-collections` | {% /tab %} {% tab title="Example" %} ```json { "data": { "attributes": { "created_at": "2026-08-01T12:00:00Z", "description": "Metrics reviewed for every checkout experiment.", "is_guardrail": false, "metrics": [ { "metric_id": "550e8400-e29b-41d4-a716-446655440020", "metric_name": "Checkout conversion" } ], "name": "Checkout metrics", "updated_at": "2026-08-02T09:30:00Z" }, "id": "550e8400-e29b-41d4-a716-446655440040", "type": "metric-collections" } } ``` {% /tab %} {% /tab %} {% tab title="400" %} Bad Request {% tab title="Model" %} API error response. | Parent field | Field | Type | Description | | ------------ | ------------------------ | -------- | ------------------------------------------------------------------------------- | | | errors [*required*] | [object] | A list of errors. | | errors | detail | string | A human-readable explanation specific to this occurrence of the error. | | errors | meta | object | Non-standard meta-information about the error | | errors | source | object | References to the source of the error. | | source | header | string | A string indicating the name of a single request header which caused the error. | | source | parameter | string | A string indicating which URI query parameter caused the error. | | source | pointer | string | A JSON pointer to the value in the request document that caused the error. | | errors | status | string | Status code of the response. | | errors | title | string | Short human-readable summary of the error. | {% /tab %} {% tab title="Example" %} ```json { "errors": [ { "detail": "Missing required attribute in body", "meta": {}, "source": { "header": "Authorization", "parameter": "limit", "pointer": "/data/attributes/title" }, "status": "400", "title": "Bad Request" } ] } ``` {% /tab %} {% /tab %} {% tab title="401" %} Unauthorized {% tab title="Model" %} API error response. | Parent field | Field | Type | Description | | ------------ | ------------------------ | -------- | ------------------------------------------------------------------------------- | | | errors [*required*] | [object] | A list of errors. | | errors | detail | string | A human-readable explanation specific to this occurrence of the error. | | errors | meta | object | Non-standard meta-information about the error | | errors | source | object | References to the source of the error. | | source | header | string | A string indicating the name of a single request header which caused the error. | | source | parameter | string | A string indicating which URI query parameter caused the error. | | source | pointer | string | A JSON pointer to the value in the request document that caused the error. | | errors | status | string | Status code of the response. | | errors | title | string | Short human-readable summary of the error. | {% /tab %} {% tab title="Example" %} ```json { "errors": [ { "detail": "Missing required attribute in body", "meta": {}, "source": { "header": "Authorization", "parameter": "limit", "pointer": "/data/attributes/title" }, "status": "400", "title": "Bad Request" } ] } ``` {% /tab %} {% /tab %} {% tab title="403" %} Forbidden {% tab title="Model" %} API error response. | Parent field | Field | Type | Description | | ------------ | ------------------------ | -------- | ------------------------------------------------------------------------------- | | | errors [*required*] | [object] | A list of errors. | | errors | detail | string | A human-readable explanation specific to this occurrence of the error. | | errors | meta | object | Non-standard meta-information about the error | | errors | source | object | References to the source of the error. | | source | header | string | A string indicating the name of a single request header which caused the error. | | source | parameter | string | A string indicating which URI query parameter caused the error. | | source | pointer | string | A JSON pointer to the value in the request document that caused the error. | | errors | status | string | Status code of the response. | | errors | title | string | Short human-readable summary of the error. | {% /tab %} {% tab title="Example" %} ```json { "errors": [ { "detail": "Missing required attribute in body", "meta": {}, "source": { "header": "Authorization", "parameter": "limit", "pointer": "/data/attributes/title" }, "status": "400", "title": "Bad Request" } ] } ``` {% /tab %} {% /tab %} {% tab title="409" %} Conflict {% tab title="Model" %} API error response. | Parent field | Field | Type | Description | | ------------ | ------------------------ | -------- | ------------------------------------------------------------------------------- | | | errors [*required*] | [object] | A list of errors. | | errors | detail | string | A human-readable explanation specific to this occurrence of the error. | | errors | meta | object | Non-standard meta-information about the error | | errors | source | object | References to the source of the error. | | source | header | string | A string indicating the name of a single request header which caused the error. | | source | parameter | string | A string indicating which URI query parameter caused the error. | | source | pointer | string | A JSON pointer to the value in the request document that caused the error. | | errors | status | string | Status code of the response. | | errors | title | string | Short human-readable summary of the error. | {% /tab %} {% tab title="Example" %} ```json { "errors": [ { "detail": "Missing required attribute in body", "meta": {}, "source": { "header": "Authorization", "parameter": "limit", "pointer": "/data/attributes/title" }, "status": "400", "title": "Bad Request" } ] } ``` {% /tab %} {% /tab %} {% tab title="415" %} Request body sent with a media type other than application/json or application/vnd.api+json. {% tab title="Model" %} API error response. | Parent field | Field | Type | Description | | ------------ | ------------------------ | -------- | ------------------------------------------------------------------------------- | | | errors [*required*] | [object] | A list of errors. | | errors | detail | string | A human-readable explanation specific to this occurrence of the error. | | errors | meta | object | Non-standard meta-information about the error | | errors | source | object | References to the source of the error. | | source | header | string | A string indicating the name of a single request header which caused the error. | | source | parameter | string | A string indicating which URI query parameter caused the error. | | source | pointer | string | A JSON pointer to the value in the request document that caused the error. | | errors | status | string | Status code of the response. | | errors | title | string | Short human-readable summary of the error. | {% /tab %} {% tab title="Example" %} ```json { "errors": [ { "detail": "Missing required attribute in body", "meta": {}, "source": { "header": "Authorization", "parameter": "limit", "pointer": "/data/attributes/title" }, "status": "400", "title": "Bad Request" } ] } ``` {% /tab %} {% /tab %} {% tab title="429" %} Too many requests {% tab title="Model" %} API error response. | Field | Type | Description | | ------------------------ | -------- | ----------------- | | errors [*required*] | [string] | A list of errors. | {% /tab %} {% tab title="Example" %} ```json { "errors": [ "Bad Request" ] } ``` {% /tab %} {% /tab %} ### Code Example ##### \## default # \# Use a Personal Access Token or Service Access Token export DD_BEARER_TOKEN="" \# Curl command curl -X POST "https://api.datadoghq.com/api/v2/experiments/metric-collections" \ -H "Accept: application/json" \ -H "Content-Type: application/json" \ -H "Authorization: Bearer ${DD_BEARER_TOKEN}" \ -d @- << EOF { "data": { "attributes": { "name": "Activation" }, "type": "metric-collections" } } EOF {% /tab %}