What `eventCount` property means in data from Microsoft Store analytics API?

Question

I am trying to get some info about errors of my desktop app from Microsoft Store analytics API. This is the response that I get from API:

{
  "Value": [
    {
      "date": "2021-05-27",
      "applicationId": "myid",
      "applicationName": "myapp",
      "failureName": "MOAPPLICATION_HANG_cfffffff_0EB8BD08.myapp!HANG_QUIESCE",
      "eventType": "hang",
      "deviceCount": 1423.0,
      "eventCount": 1244.41342561402
    },
    {
      "date": "2021-05-25",
      "applicationId": "myid",
      "applicationName": "myapp",
      "failureName": "MOAPPLICATION_HANG_cfffffff_0EB8BD08.myapp!HANG_QUIESCE",
      "eventType": "hang",
      "deviceCount": 1468.0,
      "eventCount": 1242.87238240919
    },
    {
      "date": "2021-05-26",
      "applicationId": "myid",
      "applicationName": "myapp",
      "failureName": "MOAPPLICATION_HANG_cfffffff_0EB8BD08.myapp!HANG_QUIESCE",
      "eventType": "hang",
      "deviceCount": 1480.0,
      "eventCount": 1297.92338878456
    }
  ],
  "TotalCount": 3
}

Among other things, I want to know how many errors of each type were in specified period. I hoped that field eventCount would represent this info but as I can see it's not an integer in my case. Also in Microsoft docs I can see the same thing in example.

I got two questions:

1. Which metric eventCount field represents?
2. How can I get number of errors using this API?