curl --request GET \
  --url https://api.example.com/admin/v1/item-graph/summary

{
  "data": {
    "entityCount": 123,
    "aliasCount": 123,
    "mentionCount": 123,
    "itemLinkCount": 123,
    "cooccurrenceCount": 123,
    "graphBatchCountByState": [
      {
        "name": "<string>",
        "count": 123
      }
    ],
    "itemLinkCountByType": [
      {
        "name": "<string>",
        "count": 123
      }
    ],
    "entityCountByType": [
      {
        "name": "<string>",
        "count": 123
      }
    ]
  }
}