curl --request GET \
  --url https://api.vantage.sh/v2/kubernetes_efficiency_reports \
  --header 'Authorization: Bearer <token>'

{
  "links": {
    "self": "https://api.vantage.sh/v2/kubernetes_efficiency_reports",
    "first": "https://api.vantage.sh/v2/kubernetes_efficiency_reports?page=1",
    "next": null,
    "last": "https://api.vantage.sh/v2/kubernetes_efficiency_reports?page=1",
    "prev": null
  },
  "kubernetes_efficiency_reports": [
    {
      "token": "kbnts_eff_rprt_f8d610afacc7e6c6",
      "title": "Cluster Idle Costs",
      "default": false,
      "created_at": "2024-10-25T21:20:43Z",
      "workspace_token": "wrkspc_64768b29bebf9dfe",
      "user_token": null,
      "start_date": "2024-10-01",
      "end_date": "2024-10-31",
      "date_interval": "this_month",
      "date_bucket": "day",
      "aggregated_by": "idle_cost",
      "groupings": "cluster_id"
    }
  ]
}