Creates an escalation level for an Escalation Policy

curl --request POST \
  --url https://api.rootly.com/v1/escalation_policies/{escalation_policy_id}/escalation_levels \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '
{
  "data": {
    "type": "escalation_levels",
    "attributes": {
      "position": 123,
      "notification_target_params": [
        {
          "id": "<string>",
          "type": "team",
          "team_members": "all"
        }
      ],
      "delay": 123,
      "paging_strategy_configuration_strategy": "default",
      "paging_strategy_configuration_schedule_strategy": "on_call_only",
      "escalation_policy_path_id": "<string>"
    }
  }
}
'

{
  "data": {
    "id": "9101d506-4d10-437b-8f96-31f022fa5a4a",
    "type": "escalation_levels",
    "attributes": {
      "escalation_policy_path_id": "bf330e96-7f05-4b44-ac9d-fc2bf384773c",
      "position": 1,
      "delay": 2,
      "escalation_policy_id": "8e37d84c-a745-4bd0-b9f0-ab31d6fcb968",
      "paging_strategy_configuration_strategy": null,
      "paging_strategy_configuration_schedule_strategy": null,
      "created_at": "2025-12-24T09:24:31.515-08:00",
      "updated_at": "2025-12-24T09:24:31.515-08:00",
      "notification_target_params": [
        {
          "id": "161",
          "type": "user",
          "team_members": "all"
        },
        {
          "id": "1da8a22a-7d02-4c41-8749-cc7870885554",
          "type": "schedule",
          "team_members": "all"
        },
        {
          "id": "CX21345",
          "type": "slack_channel",
          "team_members": "all"
        }
      ]
    }
  }
}