Retrieves a functionality

curl --request GET \
  --url https://api.rootly.com/v1/functionalities/{id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "a444bb18-5e83-43d9-95fd-ffea2d537ccf",
    "type": "functionalities",
    "attributes": {
      "name": "Soluta quisquam aut laborum.",
      "slug": "soluta-quisquam-aut-laborum",
      "description": "Sit fugiat et dolor.",
      "public_description": null,
      "notify_emails": [],
      "color": "#D7F5E1",
      "status": "partial_outage",
      "position": 1,
      "show_uptime": true,
      "show_uptime_last_days": 60,
      "slack_channels": [],
      "slack_aliases": [],
      "backstage_id": null,
      "external_id": null,
      "opsgenie_id": null,
      "pagerduty_id": null,
      "cortex_id": null,
      "opslevel_id": null,
      "service_now_ci_sys_id": null,
      "environment_ids": [],
      "service_ids": [],
      "owner_group_ids": [],
      "owners_group_ids": [],
      "owner_user_ids": [],
      "owners_user_ids": [],
      "incidents_count": 1,
      "created_at": "2025-09-04T10:43:28.160-07:00",
      "updated_at": "2025-09-04T10:43:28.557-07:00"
    }
  }
}