Returns a summary of the number of nodes per height and finalized height.

Example response

{
  "height": [
    {
      "value": "28080",
      "count": 10
    }
  ],
  "finalizedHeight": [
    {
      "value": "28080",
      "count": 10
    }
  ],
  "date": "2021-10-30T01:12:35.746Z"
}