Creates a functionality

curl --request POST \
  --url https://api.rootly.com/v1/functionalities \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '
{
  "data": {
    "type": "functionalities",
    "attributes": {
      "name": "<string>",
      "description": "<string>",
      "public_description": "<string>",
      "notify_emails": [
        "<string>"
      ],
      "color": "<string>",
      "position": 123,
      "backstage_id": "<string>",
      "external_id": "<string>",
      "pagerduty_id": "<string>",
      "opsgenie_id": "<string>",
      "opsgenie_team_id": "<string>",
      "cortex_id": "<string>",
      "service_now_ci_sys_id": "<string>",
      "show_uptime": true,
      "show_uptime_last_days": 60,
      "environment_ids": [
        "<string>"
      ],
      "service_ids": [
        "<string>"
      ],
      "owner_group_ids": [
        "<string>"
      ],
      "owner_user_ids": [
        123
      ],
      "slack_channels": [
        {
          "id": "<string>",
          "name": "<string>"
        }
      ],
      "slack_aliases": [
        {
          "id": "<string>",
          "name": "<string>"
        }
      ]
    }
  }
}
'

{
  "data": {
    "id": "d6e9c712-74b3-4dc5-baae-308ebb421cbf",
    "type": "functionalities",
    "attributes": {
      "name": "Add items to cart",
      "slug": "add-items-to-cart",
      "description": "Users should be able to add items to cart",
      "public_description": "Public description",
      "notify_emails": [
        "[email protected]",
        "[email protected]"
      ],
      "color": "#FFF",
      "status": "operational",
      "position": 1,
      "show_uptime": true,
      "show_uptime_last_days": 60,
      "slack_channels": [
        {
          "id": "C03MKDSEJE8",
          "name": "elastisearch"
        }
      ],
      "slack_aliases": [
        {
          "id": "S03F7QUV7F1",
          "name": "engineering"
        }
      ],
      "backstage_id": null,
      "external_id": "d795fe69-acc2-4b30-92c9-3c25cbb92056",
      "opsgenie_id": "8743a1b2-11da-480e-8493-744660987bef",
      "pagerduty_id": "PQ9K7I8",
      "cortex_id": null,
      "opslevel_id": null,
      "service_now_ci_sys_id": null,
      "environment_ids": [
        "ea24f71b-d584-4f98-95cf-8c2e7ec84029"
      ],
      "service_ids": [
        "26b154a4-d8a8-4349-8e99-868b3c621a8f"
      ],
      "owner_group_ids": [
        "1e575175-327f-4c4f-be73-0af093fff850"
      ],
      "owners_group_ids": [
        "1e575175-327f-4c4f-be73-0af093fff850"
      ],
      "owner_user_ids": [
        187
      ],
      "owners_user_ids": [
        187
      ],
      "incidents_count": 0,
      "created_at": "2026-01-03T21:26:34.515-08:00",
      "updated_at": "2026-01-03T21:26:34.515-08:00"
    }
  }
}